[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a homocysteine that has L configuration. It has a role as a mouse metabolite. It is a homocysteine and a serine family amino acid. It is a conjugate acid of a L-homocysteinate. It is a tautomer of a L-homocysteine zwitterion."}, {"from": "gpt", "value": "[C][Branch1][Ring1][C][S][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N]"}]