Synonyms: 3H,6H-Cyclopenta[5,6]cyclopropa[1,8a]naphth[2,1-c]oxepin-3,9(1H)-dione,dodecahydro-1,1,8a,11a-tetramethyl-, (5aR,6aS,8aS,11aS,11bS,13aR)- (9CI);9,19-Cyclo-A-homo-4-oxaandrostane-3,17-dione, 4a,4a,14-trimethyl-, (5a)-; (+)-Buxaheptalactone;3H,6H-Cyclopenta[5,6]cyclopropa[1,8a]naphth[2,1-c]oxepin-3,9(1H)-dione,dodecahydro-1,1,8a,11a-tetramethyl-, [8aS-(5aS*,6aR*,8aa,11ab,11ba,13ab)]-; Buxaheptalactone