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The title compound, C 32 H 48 O 4 , which was extracted from the bark of  Rhododendron arboreum , consists of five fused rings to which an acetate and seven methyl groups are attached. The  A ,  D  and  E  rings adopt chair conformations, the  B  ring is in a distorted chair and the C ring is in a half-chair conformation. The five-membered ring formed by the lactone group, which bridges from the  A / B  to the  B / C  ring junctions, is an approximate envelope with the C atom of the methyne group as the flap [displacement from the other four atoms = 0.753 (2) Å]. There are no identified directional inter­actions in the crystal structure.

4,4,6a,6b,11,12,14b-Heptamethyl-16-oxo-1,2,3,4,4a,5,6,6a,6b,7,8,9,10,11,12,12a,14a,14b-octadecahydro-12b,8a-(epoxymethano)picen-3-yl acetate