4-Piperidinecarboxylic acid, 4-(benzoylamino)-1-(phenylmethyl)-, butyl ester, ethanedioate (1:1) 57638-88-7 Butyl 1-benzyl-4-benzamido-4-piperidinecarboxylate oxalate (1:1) Oxalate de (N-benzoylamino)-4 benzyl-1 isonipecotate de n-butyle [French]