Synonyms: Butanedioicacid,mono[(3bS,4aS,5aR,6R,6aS,7aS,7bS,8aS,8bS)-1,3,3b,4,4a,6,6a,7a,7b,8b,9,10-dodecahydro-8b-methyl-6a-(1-methylethyl)-1-oxotrisoxireno[4b,5:6,7:8a,9]phenanthro[1,2-c]furan-6-yl]ester (9CI); Butanedioic acid,mono[1,3,3b,4,4a,6,6a,7a,7b,8b,9,10-dodecahydro-8b-methyl-6a-(1-methylethyl)-1-oxotrisoxireno[4b,5:6,7:8a,9]phenanthro[1,2-c]furan-6-yl]ester, [3bS-(3ba,4aa,5aS*,6b,6ab,7ab,7ba,8aR*,8bb)]-; Omtriptolide; YM 262