[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a 1,1-bis(phosphonic acid)."}, {"from": "gpt", "value": "[C][C][C][C][C][N][Branch1][C][C][C][C][C][Branch1][C][O][Branch1][=Branch2][P][=Branch1][C][=O][Branch1][C][O][O][P][=Branch1][C][=O][Branch1][C][O][O-1]"}]