10247-73-1 2-Butenoic acid, 3-methyl-, 1a,2,3,7,8,8a,9,10,11a,11b-decahydro-1a-methyl-9-methylene-5,10-dioxo-5H-3,6-methenofuro(2,3-f)oxireno(d)oxacycloundecin-8-yl ester, (1aR-(1aR*,3R*,8S*,8aR*,11aS*,11bR*))- 21899-50-3 Elephantin NSC 102817