4-Piperidinecarboxylic acid, 4-(benzoylamino)-1-(phenylmethyl)-, methyl ester, ethanedioate (1:2) 57611-90-2 Dioxalate de (N-benzoylamino)-4 benzyl-1 isonipecotate de methyle [French] Methyl 4-benzamido-1-benzyl-4-piperidinecarboxylate dioxalate