1-(2-Phenyl-2-dimethylaminoaethyl)-4-aethoxycarbonyl-4-phenylpiperidin di(hydrogenmaleat) 1-(beta-(Dimethylamino)phenethyl)-4-phenylisonipecotic acid ethyl ester maleate (1:2) 13451-56-4 ISONIPECOTIC ACID, 1-(beta-(DIMETHYLAMINO)PHENETHYL)-4-PHENYL-, ETHYL ESTER, MAL Isonipecotic acid, 1-(beta-(dimethylamino)phenethyl)-4-phenyl-, ethyl ester, maleate (1:2)