methyl (3R,4S)-4-(4-chlorophenyl)-1-methylpiperidine-3-carboxylate methyl (3R,4S)-4-(4-chlorophenyl)-1-methyl-piperidine-3-carboxylate (3R,4S)-4-(4-chlorophenyl)-1-methyl-3-piperidinecarboxylic acid methyl ester (3R,4S)-4-(4-chlorophenyl)-1-methyl-nipecotic acid methyl ester PDSP1_001293 PDSP2_001277