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2006:
Huang Sheng-Xiong; Xiao Wei-Lie; Li Li-Mei; Li Sheng-Hong; Zhou Yan; Ding Li-Sheng; Lou Li-Guang; Sun Han-Dong
Bisrubescensins A-C: three new dimeric ent-kauranoids isolated from isodon rubescens.
Organic letters 2006;
8(
6):.
[reaction: see text] A phytochemical study of the secondary metabolites produced by the species of Isodon rubescens has led to the isolation of three new dimeric ent-kauranoids and two known ones. The most important of these compounds are bisrubescensin A (1), which contains an unprecedented C(23) ent-kaurane unit, and bisrubescensin C (3), which is the precursor of bisrubescensin B (2) from the viewpoint of biosynthesis. Their structures were determined on the basis of extensive spectroscopic analysis and chemical evidence.
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