[{"from": "human", "value": "Describe this molecule. [C][C][=Branch1][C][=O][O][C][C][=C][Branch1][P][N][C@@H1][Branch1][=Branch2][C@@H1][Branch1][Branch1][C][Ring1][Ring2][=O][N][S][C][Ring1][#Branch2][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is the alpha,beta-unsaturated monocarboxylic acid that is the active nucleus for the synthesis of cephalosporins and intermediates. It is functionally related to a cephalosporanic acid. It is a tautomer of a 7beta-aminocephalosporanic acid zwitterion."}]