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organic compounds
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.