Deacetyleupaserrin

(Z)-2-Hydroxymethyl-2-butenoic acid (3aR,4R,6E,8S,10E,11aR)-2,3,3a,4,5,8,9,11a-octahydro-8-hydroxy-6,10-dimethyl-3-methylene-2-oxocyclodeca[b]furan-4-yl ester