[{"from": "human", "value": "Provide a brief overview 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 an amino acid derivative that is an intermediate in the biosynthesis of cysteine. It is the product of the ligation of homocysteine and serine by cystathionine beta synthase."}]