2-Butenoic acid, 2-methyl-, (1aR,2S,3S,4aS,6aR,7aR,10aR,12aS,14R,14aR,14bS,15aS)-3-[(2S)-2,5-dihydro-4-methyl-5-oxo-2-furanyl]tetradecahydro-6a-hydroxy-2,12,12-trimethyl-5,9-dioxo-3H,7H,9H-furo[3,2-b]furo[3'',2'':1',7'a]oxireno[3',3'a]indeno[4',5':5,6]cyclohepta[1,2-c]furan-14-yl ester, (2Z)-
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