J Integr Plant Biol. ›› 1994, Vol. 36 ›› Issue (4): -.

• Research Articles •    

Chemical Structure of Macrocalyxin G

Wang Xian-rong, Wang Hong-ping, Wang Su-qing, Shinichi Ueda and Tetsuro Fujita   

Abstract: Three crystalline components, a new diterpenoid named macrocalyxin G and two known diterpenoids rabdophyllin H and ponicidin, were isolated from the leaves of Rabdosia macrocalyx (Dunn) Hara. Based on spectroscopic and chemical evidence, the structure of macrocalyxin G was established as ent-7β-20-epoxy-6α, 7α, 14α, 15α, 16α-pentahy-drokaurane- 17-acetate.

Key words: Rabdosia macrocalyx, Ent-kaurenoids, Macrocalyxin G

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