2-Butenoic acid, 4-(((5alpha,7alpha)-17-(cyclopropylmethyl)-4,5-epoxy-3-hydroxy-6-methoxy-6,14-ethenomorphinan-7-yl)amino)-4-oxo-, methyl ester, (E)- 88167-37-7 N-Cyclopropylmethyl-7alpha-methylfumaroylamido-6,14-endoetheno-tetrahydronororipavine Nih 10236 Nih-10236