[{"from": "human", "value": "Describe this molecule. [O-1][P][=Branch1][C][=O][Branch1][C][O-1][O][P][=Branch1][C][=O][Branch1][C][O-1][O-1]"}, {"from": "gpt", "value": "The molecule is a diphosphate ion. It is a conjugate base of a diphosphate(3-)."}]