2-Butenoic acid, 2-methyl-, 2,3,3a,4,4a,5,6,7,7a,9a-decahydro-5-hydroxy-3,5,8-trimethyl-2-oxoazuleno(6,5-b)furan-6-yl ester, (3S-(3alpha,3abeta,4abeta,5beta,6beta(E),7abeta,9abeta))- 79236-46-7