J Integr Plant Biol. ›› 1994, Vol. 36 ›› Issue (10): -.

• Research Articles •    

Chemical Structure of Macrocalyxin H

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

Abstract: Three crystalline components, a new kaurane type diterpenoid named macrocalyxin H and two known diterpenoid oridonin and enmenol, were isolated from the leaves of Rabdosia macrocalyx (Dunn) Hara. Based on IR, MS, 1H-1H COSY, 13C-1H COSY and NOE spectroscopy, the structure of macrocalyxin H was determined as ent-7β-20-epoxy-lα, 6α, 7α, 15α, 16α-pentahydroxy kaurene- 17-acetate.

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

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