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Koichi Takeya

This is a preview profile on BiomedExperts - the first literature-based scientific social network. It brings the right researchers together and allows them to collaborate online. Collexis and Dell provide the BiomedExperts network of +1.5 Million pre-calculated profiles free of charge to researchers worldwide.

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TOP 3
Sato Kimihiko; Inaba Yasunori; Park Hyun-Sun; Akiyama Toshiyuki; Koyama Tetsuo; Fukaya Haruhiko; Aoyagi Yutaka; Takeya Koichi
Cytotoxic bisnor- and norditerpene dilactones having 7alpha,8alpha-epoxy-9,11-enolide substructure from Podocarpus macrophyllus D. DON.
Mohamad Khalit; Hirasawa Yusuke; Litaudon Marc; Awang Khalijah; Hadi A Hamid A; Takeya Koichi; Ekasari Wiwied; Widyawaruyanti Aty; Zaini Noor Cholies; Morita Hiroshi
Ceramicines B-D, new antiplasmodial limonoids from Chisocheton ceramicus.
Sato Kimihiko; Sugawara Keito; Takeuchi Hirono; Park Hyun-Sun; Akiyama Toshiyuki; Koyama Tetsuo; Aoyagi Yutaka; Takeya Koichi; Tsugane Takanori; Shimura Susumu
Antibacterial novel phenolic diterpenes from Podocarpus macrophyllus D. Don.

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2009: Sato Kimihiko; Inaba Yasunori; Park Hyun-Sun; Akiyama Toshiyuki; Koyama Tetsuo; Fukaya Haruhiko; Aoyagi Yutaka; Takeya Koichi
Cytotoxic bisnor- and norditerpene dilactones having 7alpha,8alpha-epoxy-9,11-enolide substructure from Podocarpus macrophyllus D. DON.
Chemical & pharmaceutical bulletin 2009;57(7):668-79.
2009: Mohamad Khalit; Hirasawa Yusuke; Litaudon Marc; Awang Khalijah; Hadi A Hamid A; Takeya Koichi; Ekasari Wiwied; Widyawaruyanti Aty; Zaini Noor Cholies; Morita Hiroshi
Ceramicines B-D, new antiplasmodial limonoids from Chisocheton ceramicus.
Bioorganic & medicinal chemistry 2009;17(2):727-30.
2008: Sato Kimihiko; Sugawara Keito; Takeuchi Hirono; Park Hyun-Sun; Akiyama Toshiyuki; Koyama Tetsuo; Aoyagi Yutaka; Takeya Koichi; Tsugane Takanori; Shimura Susumu
Antibacterial novel phenolic diterpenes from Podocarpus macrophyllus D. Don.
Chemical & pharmaceutical bulletin 2008;56(12):1691-7.
2008: Lee Ji-Ean; Hitotsuyanagi Yukio; Nakagawa Yoshie; Kato Saori; Fukaya Haruhiko; Takeya Koichi
Design and synthesis of a bis(cycloisodityrosine) analogue of RA-VII, an antitumor bicyclic hexapeptide.
Bioorganic & medicinal chemistry letters 2008;18(24):6458-61.
2008: Aoyagi Yutaka; Yamazaki Akira; Nakatsugawa Chihiro; Fukaya Haruhiko; Takeya Koichi; Kawauchi Susumu; Izumi Hiroshi
Salvileucalin B, a novel diterpenoid with an unprecedented rearranged neoclerodane skeleton from Salvia leucantha Cav.
Organic letters 2008;10(20):4429-32.
2008: Lee Ji-Ean; Hitotsuyanagi Yukio; Fukaya Haruhiko; Kondo Kazuyuki; Takeya Koichi
New cytotoxic bicyclic hexapeptides, RA-XXIII and RA-XXIV, from Rubia cordifolia L.
Chemical & pharmaceutical bulletin 2008;56(5):730-3.
2008: Aoyagi Yutaka; Hitotsuyanagi Yukio; Hasuda Tomoyo; Matsuyama Saki; Fukaya Haruhiko; Takeya Koichi; Aiyama Ritsuo; Matsuzaki Takeshi; Hashimoto Shusuke
Fluorination of triptolide and its analogues and their cytotoxicity.
Bioorganic & medicinal chemistry letters 2008;18(7):2459-63.
2008: Lee Ji-Ean; Hitotsuyanagi Yukio; Kim Ik-Hwi; Hasuda Tomoyo; Takeya Koichi
A novel bicyclic hexapeptide, RA-XVIII, from Rubia cordifolia: structure, semi-synthesis, and cytotoxicity.
Bioorganic & medicinal chemistry letters 2008;18(2):808-11.
2007: Mitsui Kumiko; Saito Hiroaki; Yamamura Ryota; Fukaya Haruhiko; Hitotsuyanagi Yukio; Takeya Koichi
Apotirucallane and tirucallane triterpenoids from Cedrela sinensis.
Chemical & pharmaceutical bulletin 2007;55(10):1442-7.
2007: Morita Hiroshi; Enomoto Maiko; Hirasawa Yusuke; Iizuka Toru; Ogawa Kazunori; Kawahara Nobuo; Goda Yukihiro; Matsumoto Teruki; Takeya Koichi
Cyclonatsudamine A, a new vasodilator cyclic peptide from Citrus natsudaidai.
Bioorganic & medicinal chemistry letters 2007;17(19):5410-3.
2007: Awang Khalijah; Lim Chong Soon; Mohamad Khalit; Morita Hiroshi; Hirasawa Yusuke; Takeya Koichi; Thoison Odile; Hadi A Hamid A
Erythrocarpines A-E, new cytotoxic limonoids from Chisocheton erythrocarpus.
Bioorganic & medicinal chemistry 2007;15(17):5997-6002.
2007: Villeneuve Masumi; Kawai Mizuo; Watanabe Motoko; Aoyagi Yutaka; Hitotsuyanagi Yukio; Takeya Koichi; Gouda Hiroaki; Hirono Shuichi; Minnikin David E; Nakahara Hiroo
Conformational behavior of oxygenated mycobacterial mycolic acids from Mycobacterium bovis BCG.
Biochimica et biophysica acta 2007;1768(7):1717-26.
2007: Nishimura Koichi; Hitotsuyanagi Yukio; Sugeta Noriko; Fukaya Haruhiko; Aoyagi Yutaka; Hasuda Tomoyo; Kinoshita Takeshi; Takeya Koichi
Tricalysiamides A-D, diterpenoid alkaloids from Tricalysia dubia.
Journal of natural products 2007;70(5):758-62.
2006: Aoyagi Yutaka; Takahashi Yoshinao; Fukaya Haruhiko; Takeya Koichi; Aiyama Ritsuo; Matsuzaki Takeshi; Hashimoto Shusuke; Kurihara Teruo
Semisynthesis of isetexane diterpenoid analogues and their cytotoxic activity.
Chemical & pharmaceutical bulletin 2006;54(11):1602-4.
2006: Mitsui Kumiko; Saito Hiroaki; Yamamura Ryota; Fukaya Haruhiko; Hitotsuyanagi Yukio; Takeya Koichi
Hydroxylated gedunin derivatives from Cedrela sinensis.
Journal of natural products 2006;69(9):1310-4.
2006: Morita Hiroshi; Eda Michiko; Iizuka Toru; Hirasawa Yusuke; Sekiguchi Mitsuhiro; Yun Young Sook; Itokawa Hideji; Takeya Koichi
Structure of a new cyclic nonapeptide, segetalin F, and vasorelaxant activity of segetalins from Vaccaria segetalis.
Bioorganic & medicinal chemistry letters 2006;16(17):4458-61.
2006: Aoyagi Yutaka; Nishioka Yumi; Tobe Fukuya; Hasuda Tomoyo; Takeya Koichi; Gui Ming-Yu; Jin Yong-Ri; Li Xu-Wen
Synthesis of 1-O-monoacyl or 12-O-monoacyl, 1-,12-O-diacyl-, and 11,12-dehydrated excisanin A 7,14-acetonides and their cytotoxic activity.
Bioorganic & medicinal chemistry 2006;14(17):5802-11.
2006: Morita Hiroshi; Iizuka Toru; Choo Chee-Yan; Chan Kit-Lam; Takeya Koichi; Kobayashi Jun'ichi
Vasorelaxant activity of cyclic peptide, cyclosquamosin B, from Annona squamosa.
Bioorganic & medicinal chemistry letters 2006;16(17):4609-11.
2006: Aoyagi Yutaka; Takahashi Yoshinao; Satake Yudai; Takeya Koichi; Aiyama Ritsuo; Matsuzaki Takeshi; Hashimoto Shusuke; Kurihara Teruo
Cytotoxicity of abietane diterpenoids from Perovskia abrotanoides and of their semisynthetic analogues.
Bioorganic & medicinal chemistry 2006;14(15):5285-91.
2006: Koizumi Takayuki; Abe Mayumi; Yamakuni Tohru; Ohizumi Yasushi; Hitotsuyanagi Yukio; Takeya Koichi; Sato Yasufumi
Metronomic scheduling of a cyclic hexapeptide Ra-VII for anti-angiogenesis, tumor vessel maturation and anti-tumor activity.
Cancer science 2006;97(7):665-74.
2006: Morita Hiroshi; Iizuka Toru; Gonda Akira; Itokawa Hideji; Takeya Koichi
Cycloleonuripeptides E and F, cyclic nonapeptides from Leonurus heterophyllus.
Journal of natural products 2006;69(5):839-41.
2006: Aoyagi Yutaka; Hitotsuyanagi Yukio; Hasuda Tomoyo; Fukaya Haruhiko; Takeya Koichi; Aiyama Ritsuo; Matsuzaki Takeshi; Hashimoto Shusuke
Semisynthesis of C-ring modified triptolide analogues and their cytotoxic activities.
Bioorganic & medicinal chemistry letters 2006;16(7):1947-9.
2006: Kim Ik Hwi; Kaneko Noriko; Uchiyama Nahoko; Lee Ji Ean; Takeya Koichi; Kawahara Nobuo; Goda Yukihiro
Two phenylpropanoid glycosides from Neopicrorhiza scrophulariiflora.
Chemical & pharmaceutical bulletin 2006;54(2):275-7.
2005: Morita Hiroshi; Iizuka Toru; Choo Chee-Yan; Chan Kit-Lam; Itokawa Hideji; Takeya Koichi
Dichotomins J and K, vasodilator cyclic peptides from Stellaria dichotoma.
Journal of natural products 2005;68(11):1686-8.
2005: Kinoshita Takeshi; Itaki Nao; Hikita Maho; Aoyagi Yutaka; Hitotsuyanagi Yukio; Takeya Koichi
The isolation and structure elucidation of a new sesquiterpene lactone from the poisonous plant Coriaria japonica (Coriariaceae).
Chemical & pharmaceutical bulletin 2005;53(8):1040-2.
2005: Morita Hiroshi; Awang Khalijah; Hadi A Hamid A; Takeya Koichi; Itokawa Hideji; Kobayashi Jun'ichi
Conformational analysis of rhazinilam and three-dimensional quantitative structure-activity relationships of rhazinilam analogues.
Bioorganic & medicinal chemistry letters 2005;15(4):1045-50.
2004: Kim Ik Hwi; Hitotsuyanagi Yukio; Takeya Koichi
Quassinoid glucosides from seeds of Brucea amarissima.
Phytochemistry 2004;65(23):3167-73.
2004: Mitsui Kumiko; Maejima Masato; Fukaya Haruhiko; Hitotsuyanagi Yukio; Takeya Koichi
Limonoids from Cedrela sinensis.
Phytochemistry 2004;65(23):3075-81.
2004: Shirota Osamu; Sekita Setsuko; Satake Motoyoshi; Morita Hiroshi; Takeya Koichi; Itokawa Hideji
Nine new isoxuxuarine-type triterpene dimers from Maytenus chuchuhuasca.
Chemistry & biodiversity 2004;1(9):1296-307.
2004: Shirota Osamu; Sekita Setsuko; Satake Motoyoshi; Morita Hiroshi; Takeya Koichi; Itokawa Hideji
Two cangorosin A type triterpene dimers from Maytenus chuchuhuasca.
Chemical & pharmaceutical bulletin 2004;52(9):1148-50.
2004: Shirota Osamu; Sekita Setsuko; Satake Motoyoshi; Morita Hiroshi; Takeya Koichi; Itokawa Hideji
Nine regioisomeric and stereoisomeric triterpene dimers from Maytenus chuchuhuasca.
Chemical & pharmaceutical bulletin 2004;52(6):739-46.
2004: Fujiwara Hironori; Saito Shin-ya; Hitotsuyanagi Yukio; Takeya Koichi; Ohizumi Yasushi
RA-VII, a cyclic depsipeptide, changes the conformational structure of actin to cause G2 arrest by the inhibition of cytokinesis.
Cancer letters 2004;209(2):223-9.
2004: Kim Ik Hwi; Takashima Satoru; Hitotsuyanagi Yukio; Hasuda Tomoyo; Takeya Koichi
New quassinoids, javanicolides C and D and javanicosides B--F, from seeds of Brucea javanica.
Journal of natural products 2004;67(5):863-8.
2004: Hitotsuyanagi Yukio; Motegi Shuichi; Hasuda Tomoyo; Takeya Koichi
Semisynthesis of an analogue of antitumor bicyclic hexapeptide RA-VII by fixing the Ala-2/Tyr-3 bond to Cis by incorporating a triazole cis-amide bond surrogate.
Organic letters 2004;6(7):1111-4.
2004: Gui Ming-Yu; Aoyagi Yutaka; Jin Yong-Ri; Li Xu-Wen; Hasuda Tomoyo; Takeya Koichi
Excisanin H, a novel cytotoxic 14,20-epoxy-ent-kaurene diterpenoid, and three new ent-kaurene diterpenoids from Rabdosia excisa.
Journal of natural products 2004;67(3):373-6.
2004: Hitotsuyanagi Yukio; Hasuda Tomoyo; Aihara Takayuki; Ishikawa Hiroshi; Yamaguchi Kentaro; Itokawa Hideji; Takeya Koichi
Synthesis of [Gly-1]RA-VII, [Gly-2]RA-VII, and [Gly-4]RA-VII. Glycine-containing analogues of RA-VII, an antitumor bicyclic hexapeptide from Rubia plants.
The Journal of organic chemistry 2004;69(5):1481-6.
2003: Aoyagi Yutaka; Saitoh Yoshihiro; Ueno Tasuku; Horiguchi Mai; Takeya Koichi; Williams Robert M
Lipase TL-mediated kinetic tesolution of 5-benzyloxy-1-tert-butyldimethylsilyloxy-2-pentanol at low temperature: concise asymmetric synthesis of both enantiomers of a piperazic acid derivative.
The Journal of organic chemistry 2003;68(18):6899-904.
2003: Hitotsuyanagi Yukio; Sasaki Shin-Ichi; Matsumoto Yuji; Yamaguchi Kentaro; Itokawa Hideji; Takeya Koichi
Synthesis of [L-Ala-1]RA-VII, [D-Ala-2]RA-VII, and [D-Ala-4]RA-VII by epimerization of RA-VII, an antitumor bicyclic hexapeptide from Rubia plants, through oxazoles.
Journal of the American Chemical Society 2003;125(24):7284-90.
2003: Park Hyun-Sun; Takahashi Yoshinao; Fukaya Haruhiko; Aoyagi Yutaka; Takeya Koichi
S(R)-podolactone D, a new sulfoxide-containing norditerpene dilactone from Podocarpus macrophyllus var. maki.
Journal of natural products 2003;66(2):282-4.
2002: Kamano Yoshiaki; Yamashita Ayano; Nogawa Toshihiko; Morita Hiroshi; Takeya Koichi; Itokawa Hideji; Segawa Toshiaki; Yukita Ayako; Saito Kyoko; Katsuyama Mariko; Pettit George R
QSAR evaluation of the Ch'an Su and related bufadienolides against the colchicine-resistant primary liver carcinoma cell line PLC/PRF/5(1).
Journal of medicinal chemistry 2002;45(25):5440-7.
2002: Matsumoto Teruki; Nishimura Koichi; Takeya Koichi
New cyclic peptides from Citrus medica var. sarcodactylis SWINGLE.
Chemical & pharmaceutical bulletin 2002;50(6):857-60.
2002: Hitotsuyanagi Yukio; Motegi Shuichi; Fukaya Haruhiko; Takeya Koichi
A cis amide bond surrogate incorporating 1,2,4-triazole.
The Journal of organic chemistry 2002;67(10):3266-71.
2002: Ang Hooi Hoon; Hitotsuyanagi Yukio; Fukaya Haruhiko; Takeya Koichi
Quassinoids from Eurycoma longifolia.
Phytochemistry 2002;59(8):833-7.
2001: Hitotsuyanagi Y; Ozeki A; Itokawa H; de Mello Alves S; Takeya K
Cedronolactone E, a novel C(19) quassinoid from Simaba cedron.
Journal of natural products 2001;64(12):1583-4.
2001: Kobayashi J; Suzuki H; Shimbo K; Takeya K; Morita H
Celogentins A-C, new antimitotic bicyclic peptides from the seeds of Celosia argentea.
The Journal of organic chemistry 2001;66(20):6626-33.
2001: Choo C Y; Chan K L; Sam T W; Hitotsuyanagi Y; Takeya K
The cytotoxicity and chemical constituents of the hexane fraction of Typhonium flagelliforme (Araceace).
Journal of ethnopharmacology 2001;77(1):129-31.
2001: Matsumoto T; Shishido A; Morita H; Itokawa H; Takeya K
Cyclolinopeptides F-I, cyclic peptides from linseed.
Phytochemistry 2001;57(2):251-60.
2001: Choo C Y; Chan K L; Takeya K; Itokawa H
Cytotoxic activity of Typhonium flagelliforme (Araceae).
Phytotherapy research : PTR 2001;15(3):260-2.
2000: Haraguchi M; Mimaki Y; Motidome M; Morita H; Takeya K; Itokawa H; Yokosuka A; Sashida Y
Steroidal saponins from the leaves of Cestrum sendtenerianum.
Phytochemistry 2000;55(7):715-20.
2000: Morita H; Sato Y; Chan K L; Choo C Y; Itokawa H; Takeya K; Kobayashi J
Samoquasine A, a benzoquinazoline alkaloid from the seeds of Annona squamosa.
Journal of natural products 2000;63(12):1707-8.
2000: Hitotsuyanagi Y; Fukuyo M; Tsuda K; Kobayashi M; Ozeki A; Itokawa H; Takeya K
4-Aza-2,3-dehydro-4-deoxypodophyllotoxins: simple aza-podophyllotoxin analogues possessing potent cytotoxicity.
Bioorganic & medicinal chemistry letters 2000;10(4):315-7.
1999: Itokawa H; Takeya K; Hitotsuyanagi Y; Morita H
[Antitumor compounds isolated from higher plants]
Yakugaku zasshi : Journal of the Pharmaceutical Society of Japan 1999;119(8):529-83.
1998: Kamano Y; Kotake A; Hashima H; Inoue M; Morita H; Takeya K; Itokawa H; Nandachi N; Segawa T; Yukita A; Saitou K; Katsuyama M; Pettit G R
Structure-cytotoxic activity relationship for the toad poison bufadienolides.
Bioorganic & medicinal chemistry 1998;6(7):1103-15.
1998: Ozeki A; Hitotsuyanagi Y; Hashimoto E; Itokawa H; Takeya K; de Mello Alves S
Cytotoxic quassinoids from Simaba cedron.
Journal of natural products 1998;61(6):776-80.
1998: Yun Y S; Shimizu K; Morita H; Takeya K; Itokawa H; Shirota O
Triterpenoid saponin from Vaccaria segetalis.
Phytochemistry 1998;47(1):143-4.
1997: Morita H; Yun Y S; Takeya K; Itokawa H
Conformational preference for segetalins G and H, cyclic peptides with estrogen-like activity from seeds of Vaccaria segetalis.
Bioorganic & medicinal chemistry 1997;5(11):2063-7.
1997: Hirobe C; Qiao Z S; Takeya K; Itokawa H
Cytotoxic flavonoids from Vitex agnus-castus.
Phytochemistry 1997;46(3):521-4.
1997: Morita H; Takeya K; Itokawa H
Cyclic octapeptides from Stellaria dichotoma var. lanceolata.
Phytochemistry 1997;45(4):841-5.
1997: Morita H; Gonda A; Wei L; Yamamura Y; Takeya K; Itokawa H
Taxuspinananes A and B, new taxoids from Taxus cuspidata var. nana.
Journal of natural products 1997;60(4):390-2.
1997: Yun Y S; Morita H; Takeya K; Itokawa H
Cyclic peptides from higher plants. 34. Segetalins G and H, structures and estrogen-like activity of cyclic pentapeptides from Vaccaria segetalis.
Journal of natural products 1997;60(3):216-8.
1997: Morita H; Yun Y S; Takeya K; Itokawa H; Shirota O
Thionation of segetalins A and B, cyclic peptides with estrogen-like activity from seeds of Vaccaria segetalis.
Bioorganic & medicinal chemistry 1997;5(3):631-6.
1997: Nagaya H; Tobita Y; Nagae T; Itokawa H; Takeya K; Halim A F; Abdel-Halim O B
Cytotoxic triterpenes from Cleome africana.
Phytochemistry 1997;44(6):1115-9.
1997: Takano I; Yasuda I; Nishijima M; Yanagi Y; Takeya K; Itokawa H
Ester-type cephalotaxus alkaloids from Cephalotaxus harringtonia var. drupacea.
Phytochemistry 1997;44(4):735-8.
1996: Morita H; Kayashita T; Takeya K; Itokawa H
Conformational analysis of a cyclic heptapeptide, pseudostellarin D by molecular dynamics and Monte Carlo simulations.
Chemical & pharmaceutical bulletin 1996;44(11):2177-80.
1996: Takeya K; Quio Z S; Hirobe C; Itokawa H
Cytotoxic trichilin-type limonoids from Melia azedarach.
Bioorganic & medicinal chemistry 1996;4(8):1355-9.
1996: el-Gamal A A; Takeya K; Itokawa H; Halim A F; Amer M M; Saad H E; Awad S A
Anthraquinones from the polar fractions of Galium sinaicum.
Phytochemistry 1996;42(4):1149-55.
1996: Takeya K; Qiao Z S; Hirobe C; Itokawa H
Cytotoxic azadirachtin-type limonoids from Melia azedarach.
Phytochemistry 1996;42(3):709-12.
1996: Morita H; Nagashima S; Uchiumi Y; Kuroki O; Takeya K; Itokawa H
Cyclic peptides from higher plants. XXVIII. Antitumor activity and hepatic microsomal biotransformation of cyclic pentapeptides, astins, from Aster tataricus.
Chemical & pharmaceutical bulletin 1996;44(5):1026-32.
1996: Morita H; Yun Y S; Takeya K; Itokawa H; Shirota O
A cyclic heptapeptide from Vaccaria segetalis.
Phytochemistry 1996;42(2):439-41.
1996: Morita H; Kayashita T; Shimomura M; Takeya K; Itokawa H
Cyclic peptides from higher plants. 24.1 yunnanin C, a novel cyclic heptapeptide from Stellaria yunnanensis.
Journal of natural products 1996;59(3):280-2.
1995: Itokawa H; Yun Y; Morita H; Takeya K; Yamada K
Estrogen-like activity of cyclic peptides from Vaccaria segetalis extracts.
Planta medica 1995;61(6):561-2.
1995: Morita H; Nagashima S; Takeya K; Itokawa H
Solution forms of antitumor cyclic pentapeptides with 3,4-dichlorinated proline residues, astins A and C, from Aster tataricus.
Chemical & pharmaceutical bulletin 1995;43(8):1395-7.
1995: Itokawa H; Qiao Z S; Hirobe C; Takeya K
Cytotoxic limonoids and tetranortriterpenoids from Melia azedarach.
Chemical & pharmaceutical bulletin 1995;43(7):1171-5.
1995: Morita H; Kayashita T; Takeya K; Itokawa H
Cyclic peptides from higher plants, Part 15. Pseudostellarin H, a new cyclic octapeptide from Pseudostellaria heterophylla.
Journal of natural products 1995;58(6):943-7.
1995: Morita H; Nagashima S; Takeya K; Itokawa H
Structure of a new peptide, astin J, from Aster tataricus.
Chemical & pharmaceutical bulletin 1995;43(2):271-3.
1994: Shirota O; Morita H; Takeya K; Itokawa H
Cytotoxic aromatic triterpenes from Maytenus ilicifolia and Maytenus chuchuhuasca.
Journal of natural products 1994;57(12):1675-81.
1994: Itokawa H; Miyashita T; Morita H; Takeya K; Hirano T; Homma M; Oka K
Structural and conformational studies of [Ile7] and [Leu7]surfactins from Bacillus subtilis natto.
Chemical & pharmaceutical bulletin 1994;42(3):604-7.
1993: Itokawa H; Ibraheim Z Z; Qiao Y F; Takeya K
Anthraquinones, naphthohydroquinones and naphthohydroquinone dimers from Rubia cordifolia and their cytotoxic activity.
Chemical & pharmaceutical bulletin 1993;41(10):1869-72.
1993: Morita H; Matsumoto K; Takeya K; Itokawa H
Conformation of tropolone ring in antileukemic tropoloisoquinoline alkaloids.
Chemical & pharmaceutical bulletin 1993;41(8):1478-80.
1993: Morita H; Matsumoto K; Takeya K; Itokawa H; Iitaka Y
Structures and solid state tautomeric forms of two novel antileukemic tropoloisoquinoline alkaloids, pareirubrines A and B, from Cissampelos pareira.
Chemical & pharmaceutical bulletin 1993;41(8):1418-22.
1993: Itokawa H; Kondo K; Hitotsuyanagi Y; Isomura M; Takeya K
Studies on RA derivatives. V. Synthesis and antitumor activity of Ala2-modified RA-VII derivatives.
Chemical & pharmaceutical bulletin 1993;41(8):1402-10.
1993: Itokawa H; Kondo K; Hitotsuyanagi Y; Nakamura A; Morita H; Takeya K
Preparation and cytotoxicity of cyclic hexapeptides, RA derivatives.
Chemical & pharmaceutical bulletin 1993;41(7):1266-9.
1993: Itokawa H; Masuyama K; Morita H; Takeya K
Cytotoxic sesquiterpenes from Nardostachys chinensis.
Chemical & pharmaceutical bulletin 1993;41(6):1183-4.
1993: Takeya K; Yamamiya T; Morita H; Itokawa H
Two antitumour bicyclic hexapeptides from Rubia cordifolia.
Phytochemistry 1993;33(3):613-5.
1993: Morita H; Nagashima S; Takeya K; Itokawa H
Astins A and B, antitumor cyclic pentapeptides from Aster tataricus.
Chemical & pharmaceutical bulletin 1993;41(5):992-3.
1993: Oka K; Hirano T; Homma M; Ishii H; Murakami K; Mogami S; Motizuki A; Morita H; Takeya K; Itokawa H
Satisfactory separation and MS-MS spectrometry of six surfactins isolated from Bacillus subtilis natto.
Chemical & pharmaceutical bulletin 1993;41(5):1000-2.
1993: Morita H; Yamamiya T; Takeya K; Itokawa H; Sakuma C; Yamada J; Suga T
Conformational recognition of RA-XII by 80S ribosomes: a differential line broadening study in 1H NMR spectroscopy.
Chemical & pharmaceutical bulletin 1993;41(4):781-3.
1992: Ichihara Y; Takeya K; Hitotsuyanagi Y; Morita H; Okuyama S; Suganuma M; Fujiki H; Motidome M; Itokawa H
Cajucarinolide and isocajucarinolide: anti-inflammatory diterpenes from Croton cajucara.
Planta medica 1992;58(6):549-51.
1992: Itokawa H; Saitou K; Morita H; Takeya K; Yamada K
Structures and conformations of metabolites of antitumor cyclic hexapeptides, RA-VII and RA-X.
Chemical & pharmaceutical bulletin 1992;40(11):2984-9.
1992: Morita H; Yamamiya T; Takeya K; Itokawa H
New antitumor bicyclic hexapeptides, RA-XI, -XII, -XIII and -XIV from Rubia cordifolia.
Chemical & pharmaceutical bulletin 1992;40(5):1352-4.
1992: Itokawa H; Morita H; Takeya K
Solution forms of an antitumor cyclic hexapeptide, RA-VII in dimethyl sulfoxide-d6 from nuclear magnetic resonance studies.
Chemical & pharmaceutical bulletin 1992;40(4):1050-2.
1991: Itokawa H; Saitou K; Morita H; Takeya K
Conformational analysis of [n-demethyl-Tyr(OCH3)-3]RA-VII, conformationally restricted model approach.
Chemical & pharmaceutical bulletin 1991;39(8):2161-3.
1991: Itokawa H; Ichihara Y; Mochizuki M; Enomori T; Morita H; Shirota O; Inamatsu M; Takeya K
A cytotoxic substance from Sangre de Grado.
Chemical & pharmaceutical bulletin 1991;39(4):1041-2.
1991: Morita H; Nakayama M; Kojima H; Takeya K; Itokawa H; Schenkel E P; Motidome M
Structures and cytotoxic activity relationship of casearins, new clerodane diterpenes from Casearia sylvestris Sw.
Chemical & pharmaceutical bulletin 1991;39(3):693-7.
1990: Itokawa H; Totsuka N; Morita H; Takeya K; Iitaka Y; Schenkel E P; Motidome M
New antitumor principles, casearins A-F, for Casearia sylvestris Sw. (Flacourtiaceae).
Chemical & pharmaceutical bulletin 1990;38(12):3384-8.
1989: Itokawa H; Totsuka N; Nakahara K; Maezuru M; Takeya K; Kondo M; Inamatsu M; Morita H
A quantitative structure-activity relationship for antitumor activity of long-chain phenols from Ginkgo biloba L.
Chemical & pharmaceutical bulletin 1989;37(6):1619-21.
1988: Itokawa H; Morita H; Katou I; Takeya K; Cavalheiro A J; de Oliveira R C; Ishige M; Motidome M
Cytotoxic diterpenes from the rhizomes of Hedychium coronarium.
Planta medica 1988;54(4):311-5.
1988: Itokawa H; Morita H; Takeya K; Motidome M
Diterpenes from rhizomes of Hedychium coronarium.
Chemical & pharmaceutical bulletin 1988;36(7):2682-4.
1988: Itokawa H; Totsuka N; Takeya K; Watanabe K; Obata E
Antitumor principles from Casearia sylvestris Sw. (Flacourtiaceae), structure elucidation of new clerodane diterpenes by 2-D NMR spectroscopy.
Chemical & pharmaceutical bulletin 1988;36(4):1585-8.
1987: Itokawa H; Totsuka N; Nakahara K; Takeya K; Lepoittevin J P; Asakawa Y
Antitumor principles from Ginkgo biloba L.
Chemical & pharmaceutical bulletin 1987;35(7):3016-20.
1987: Itokawa H; Morita H; Sumitomo T; Totsuka N; Takeya K
Antitumour principles from Alpinia galanga.
Planta medica 1987;53(1):32-3.

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