[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a piperidinecarboxylate that is the conjugate base of pipecolic acid. It has a role as a human metabolite. It is a conjugate base of a pipecolic acid."}, {"from": "gpt", "value": "[C][C][C][N][C][Branch1][Ring2][C][Ring1][=Branch1][C][=Branch1][C][=O][O-1]"}]