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The title compound, 4,4,8,11b-tetra­methyl-2,3,4,4a,5,6,6a,7,10a,11,11a,11b-dodeca­hydro-1H,9H-6a:7,10a:11-diepoxy­phen­anthro[3,2-b]furan-9-one, C20H26O4, a natural ent-abietane diterpenoid, is composed of four fused rings with the expected cis and trans junctions. In the crystal structure, the mol­ecules stack along the b axis and are linked by C—H...O hydrogen bonds.
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