Synonyms: 1,5-Cyclo-1,10-seco-10a-con-8-enin-2-one (8CI);1,5-Cyclo-1,10-secocon-8-enin-2-one, (5b,10a)-; Neoconenone (7CI);Spiro[9H-benz[4,5]indeno[1,7a-c]pyrrole-9,1'-cyclopentan]-3'-one,1,2,2a,3,4,5,6,7,8,10,11,11b-dodecahydro-3,4,8-trimethyl-,(1'R,2aS,3S,5aR,8S,11bS)- (9CI);Spiro[9H-benz[4,5]indeno[1,7a-c]pyrrole-9,1'-cyclopentan]-3'-one,1,2,2a,3,4,5,6,7,8,10,11,11b-dodecahydro-3,4,8-trimethyl-, [2aS-(2aa,3b,5aS*,8a,9b,11ba)]-