[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a 1,1-bis(phosphonic acid)."}, {"from": "gpt", "value": "[C][C][Branch1][=N][O][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][O][Branch1][=Branch2][P][=Branch1][C][=O][Branch1][C][O][O][P][=Branch1][C][=O][Branch1][C][O][O]"}]