银线草醇 c

2-Butenoic acid,2-methyl-,[(1aR,1bS,2R,4aR,4bS,8aS,9R,9aS,10aR,10bS,10cS,11bS)-1,1a,1b,2,3,4,4a,6,8,8a,9,9a,10,10a,10b,10c,11,11b-octadecahydro-2,9-dihydroxy-7-(hydroxymethyl)-4-(2-methoxy-1-methyl-2-oxoethylidene)-1b,10b-dimethyl-3,6-dioxocyclopropa[4,5]cyclopropa[4',5']cyclopent[1',2':7,8]acephenanthryleno[10a,10-b]furan-9-yl]methylester, (2E)-