1-(beta-Morpholinophenethyl)-4-phenylisonipecotic acid ethyl ester maleate (1:1) 13451-61-1 ISONIPECOTIC ACID, 1-(beta-MORPHOLINOPHENETHYL)-4-PHENYL-, ETHYL ESTER, MALEATE Isonipecotic acid, 1-(beta-morpholinophenethyl)-4-phenyl-, ethyl ester, maleate (1:1)