[{"from": "human", "value": "Provide a description of this molecule. [C][Branch1][=N][C][S][C][C][Branch1][=Branch1][C][=Branch1][C][=O][O][N][C][Branch1][=Branch1][C][=Branch1][C][=O][O][N]"}, {"from": "gpt", "value": "The molecule is a modified amino acid generated by enzymic means from homocysteine and serine. It has a role as a metabolite. It is a member of cystathionines and an organic sulfide."}]