[{"from": "human", "value": "Describe this molecule. [C][O][C@@][Branch2][Ring1][#C][C@@H1][N][Branch1][Branch1][C][Ring1][Ring2][=O][C][=Branch1][#C][=C][Branch1][Branch1][C][S][Ring1][Branch2][C][O][C][=Branch1][C][=O][N][C][=Branch1][C][=O][O-1][N][C][=Branch1][C][=O][C][C][=C][C][=C][S][Ring1][Branch1]"}, {"from": "gpt", "value": "The molecule is a cephalosporin carboxylic acid anion having methoxy, 2-thienylacetamido and carbamoyloxymethyl side-groups, formed by proton loss from the carboxy group of the semisynthetic cephamycin antibiotic cefoxitin. It is a conjugate base of a cefoxitin."}]