CAS No 142279-42-3 , Propanoic acid,2-[(1aR,1bS,2R,4aR,4bS,8aS,9R,9aS,10aR,10bS,10cS,11bS)-9-[(acetyloxy)methyl]-1a,1b,2,3,4a,6,8,8a,9,9a,10,10a,10b,10c,11,11b-hexadecahydro-2-hydroxy-7-(hydroxymethyl)-1b,10b-dimethyl-3,6-dioxocyclopropa[4,5]cyclopropa[4',5']cyclopent[1',2':7,8]acephenanthryleno[10a,10-b]furan-4(1H)-ylidene]-,methyl ester, (2Z)-