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Argatroban Impurity 39 Argatroban Related Compound 2 Ethyl (2S,4R)-4-Methylpipecolate ethyl (2R,4S)-4-methyl-2-pipecolate (2S,4R)-ethyl 4-methylpiperidine-2-carboxylate Ethyl (2R,4S)-4-methyl-2-piperidinecarboxylate (2S,4R)-4-Methyl-2-piperidinecarboxylic Acid Ethyl Ester (2S-cis)-4-Methyl-2-piperidinecarboxylic Acid Ethyl Ester Argatroban Impurity 39 (Ethyl (2S,4R)-4-Methylpipecolate) (2S-cis)-4-Methyl-2-piperidineCarboxylic Acid Ethyl Ester (Afatinib Impurity）