[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is an acyclic phosphorus acid anhydride."}, {"from": "gpt", "value": "[C][C@@H1][Branch2][Ring1][=Branch1][C][P][=Branch1][C][=O][Branch1][=Branch1][C@@H1][Branch1][C][C][N][O][P][=Branch1][C][=O][Branch1][C][O][O][C][=Branch1][C][=O][O]"}]