Showing structure for [3aR-[3aR*,4R*[E(E)],6E,9S*,10E,11aR*]]-2-[[(2,3,3a,4,5,8,9,11a-Octahydro-9-hydroxy-6,10-dimethyl-3-methylene-2-oxocyclodeca[b]furan-4-yl)oxy]carbonyl]-2-butenyl ester 2-(hydroxymethyl)-2-butenoic acid