diphenoxylate1-(3-cyano-3,3-diphenylpropyl)-4-phenyl-isonipecotic acid ethyl ester2,2-diphenyl-4-(4-carbethoxy-4-phenylpiperidino)butyronitrile4-ethoxycarbonyl-alpha,alpha,4-triphenyl-1-piperidinebutyronitrileethyl 1-(3-cyano-3,3-diphenylpropyl)-4-phenyl-4-piperidinecarboxylateethyl 1-(3-cyano-3,3-diphenylpropyl)-4-phenylisonipecotate