4. Tirucalla-5,24-dien-3β-ol [(13α,14β,17α,20S)-lanosta-5,24-dien-3β-ol] and three other Δ5-unsaturated tirucallanes from the roots of Bryonia dioica Jacq.: the first naturally occurring C-10 methylated tetracyclic triterpene alcohols with a Δ5-monounsaturated skeleton Toshihiro Akihisa,Yumiko Kimura,Wilhelmus C. M. C. Kokke,Sei-ichi Takase,Ken Yasukawa,Toshitake Tamura J. Chem. Soc. Perkin Trans. 1 1996 2379
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