1-Methyl-4-phenylpiperidine-4-carbonitrile 3627-62-1 4-Cyano-1-methyl-4-phenylpiperidine 4-Piperidinecarbonitrile, 1-methyl-4-phenyl- DEA No. 9232 EINECS 222-847-7 Pethidine - Intermediate-A