lychnopholide

(Z)-2-Methyl-2-butenoic acid (3aR,4S,6R,10Z,11aR)-2,3,3a,4,5,6,7,11a-octahydro-6,10-dimethyl-3-methylene-2,7-dioxo-6,9-epoxycyclodeca[b]furan-4-yl ester