[{"from": "human", "value": "Describe this molecule. [C][Branch1][Ring1][C][S][C][Branch1][=Branch1][C][=Branch1][C][=O][O][N]"}, {"from": "gpt", "value": "The molecule is a sulfur-containing amino acid consisting of a glycine core with a 2-mercaptoethyl side-chain. It has a role as a fundamental metabolite. It is a sulfur-containing amino acid, a member of homocysteines and a non-proteinogenic alpha-amino acid. It is a conjugate acid of a homocysteinate. It is a tautomer of a homocysteine zwitterion."}]