[{"from": "human", "value": "Describe this molecule. [C][/C][=Branch2][Ring1][Ring2][=C][\\C][O][P][=Branch1][C][=O][Branch1][C][O-1][O][P][=Branch1][C][=O][Branch1][C][O-1][O-1][/C][O]"}, {"from": "gpt", "value": "The molecule is an organophosphate oxoanion that is the trianion of (2E)-4-hydroxy-3-methylbut-2-enyl diphosphate arising from deprotonation of the three OH groups of the diphosphate. It has a role as an epitope and a phosphoantigen. It is a conjugate base of a (2E)-4-hydroxy-3-methylbut-2-en-1-yl diphosphate."}]