[{"from": "human", "value": "Provide a description of this molecule. [C][=C][C][=Branch1][O][=C][C][=C][Ring1][=Branch1][N+1][=Branch1][C][=O][O-1][O][P][=Branch1][C][=O][Branch1][#Branch2][C][C][C][C][C][=Branch1][C][=O][O][O-1]"}, {"from": "gpt", "value": "The molecule is an organophosphonate oxoanion that is a nitrophenyl phosphonate hapten and transition-state analogue derived from pentanoic acid, with affinity for the germline precursor to catalytic antibody 48G7. It has a role as an epitope. It is a C-nitro compound, a monocarboxylic acid and an organophosphonate oxoanion."}]