Methadone-Intermediate, 4-cyano-2dimethylamino-4, 4-diphenyl butane Moramide-Intermediate, 2-methyl-3-morpholino-1,1-diphenylpropane-carboxylic acid |
Pethidine-Intermediate-A, 4-cyano-1-methyl-4-phenylpiperidine Pethidine-Intermediate-B, ethyl-4-phenylpiperidine-4-carboxylate Pethidine-Intermediate-C, 1-methyl-4-phenylpiperidine-4-carboxylic acid |