[{"from": "human", "value": "Provide a description of this molecule. [C][C][P][=Branch1][C][=O][Branch1][C][O][O][C][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][N+1][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is a C-nitro compound that is ethylphosphonic acid esterified with (4-nitrophenyl)methanol; a phosphonate transition state analogue with affinity for catalytic antibody 7B9. It is a C-nitro compound and a phosphonic ester."}]