Isoalangidiol Monoacetate, a Triterpene Alcohol

Isoalangidiol (3α,18α-B':A'-neogammacerane-3,18-diol) has been extracted as a natural product from the leaves of Alangium lamarckii Thw. (Alangiaceae). The crystal structure study of its monoacetate, C₃₂H₅₄O₃, was undertaken in order to ascertain the conformation of the compound. The four six-membered rings are in chair conformations. The five-membered ring is distorted from a plane and is twisted, with a C19—C18—C17—C21 torsion angle of −43.0 (4)°. The molecular parameters of the compound are all within normal limits.

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