2-Methylbutanoic acid [(3aR,4R,6R,8Z)-2,3,3aβ,4,5,6,7,11aα-octahydro-10-hydroxymethyl-6-methyl-3-methylene-2,7-dioxo-6,9-epoxycyclodeca[b]furan]-4-yl ester | 2-Methylbutanoic acid [(3aR,4R,6R,8Z)-2,3,3aβ,4,5,6,7,11aα-octahydro-10-hydroxymethyl-6-methyl-3-methylene-2,7-dioxo-6,9-epoxycyclodeca[b]furan]-4-yl ester | |