1-(2-Phenyl-2-piperidinoaethyl)-4-aethoxycarbonyl-4-phenylpiperidin di(hydrogenmaleat) 14771-43-8 4-Phenyl-1-(beta-piperidinophenethyl)isonipecotic acid ethyl ester maleate (1:2) ISONIPECOTIC ACID, 4-PHENYL-1-(beta-PIPERIDINOPHENETHYL)-, ETHYL ESTER, MALEATE Isonipecotic acid, 4-phenyl-1-(beta-piperidinophenethyl)-, ethyl ester, maleate (1:2)