Three new dihydroxy-3-friedelanone triterpenes were isolated from the leaves and the stem bark of the Cameroonian medicinal plant Lepidobotrys staudtii. Structure elucidation by spectroscopic techniques showed that they are 2α,29-dihydroxy-3-friedelanone (1a), 2β,21α-dihydroxy-3-friedelanone (2a) and 6β,21α-dihydroxy-3-friedelanone (3). In addition, the known monohydroxy-3-friedelanones 4, 5, 6 and 7 were obtained.

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Journal Tetrahedron
Tane, P. (Pierre), Tsopmo, A, Ngnokam, D. (David), Ayafor, J.F. (J. Foyere), & Sterner, O. (Olov). (1996). New friedelane triterpenes from Lepidobotrys staudtii. Tetrahedron, 52(47), 14989–14994. doi:10.1016/0040-4020(96)00910-6