75683-57-7 (2E)-4-Hydroxy-2-methyl-2-butenoic acid [(3aR,4R,6Z,10Z,11aR)-10-acetoxymethyl-2,3,3a,4,5,8,9,11a-octahydro-6-hydroxymethyl-3-methylene-2-oxocyclodeca[b]furan-4-yl] ester 75683-60-2 2-Methylbutanoic acid [[(3aR,4R,6Z,10Z,11aR)-10-acetoxymethyl-2,3,3a,4,5,8,9,11a-octahydro-4-hydroxy-3-methylene-2-oxocyclodeca[b]furan-6-yl]methyl] ester