eupaformosanin

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