94190-30-4 (E)-2-Methyl-2-butenoic acid (3aR)-2,3,3aβ,4,5,5a,6,7,8,9bα-decahydro-6α,8β-dihydroxy-5aα,9-dimethyl-3-methylene-2-oxonaphtho[1,2-b]furan-4α-yl ester 94190-31-5 (E)-2-Methyl-2-butenoic acid (3aR)-2,3,3aβ,4,5,5a,6,7,8,9,9aβ,9bα-dodecahydro-6α,8β-dihydroxy-5aα-methyl-3,9-bis(methylene)-2-oxonaphtho[1,2-b]furan-4α-yl ester