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Ethyl 1-benzylpiperidine-4-carboxylate Ethyl 1-methyl-4-piperidinecarboxylate 1-Methylpiperidine-4-carboxylic acid hydrochloride N-Boc-piperidine-3-methanol 1-BENZOYLPIPERIDINE-4-CARBOXYLIC ACID (R)-N-Boc-3-aminomethylpiperidine N-Boc-piperidine-2-methanol N-Methylpiperidine 1-METHYLPIPERIDINE-2-CARBOXYLIC ACID HYDROCHLORIDE 1-Cbz-Piperidin-4-ylidene-acetic acid