Oxo Propenoic acid
2-(Hydroxymethyl)-2-propenoic acid (4S,6R,7S,10R)-3-[(acetyloxy)methyl]-2,4,5,6,7,8,9,10-octahydro-6,7-dihydroxy-6,10-dimethyl-2-oxo-7,10-epoxy(11E)-cyclodeca[b]furan-4-yl ester
2-Methyl-2-propenoic acid (4S,6R,7S,10R)-2,4,5,6,7,8,9,10-octahydro-7-hydroxy-3-(hydroxymethyl)-6,10-dimethyl-2-oxo-7,10-epoxy(11E)-cyclodeca[b]furan-4-yl ester