2-Butenoic acid, 2-methyl-, 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, [3aR-[3aR*,4S*(Z),6R*,10Z,11aR*]]- 77448-64-7 Lychnopholide NSC669145