[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is an organophosphate oxoanion that is the trianion of isopentenyl diphosphate arising from deprotonation of the three OH groups of the diphosphate. It has a role as an epitope, a phosphoantigen, a human metabolite and a Saccharomyces cerevisiae metabolite. It is a conjugate base of an isopentenyl diphosphate."}, {"from": "gpt", "value": "[C][C][=Branch1][C][=C][C][C][O][P][=Branch1][C][=O][Branch1][C][O-1][O][P][=Branch1][C][=O][Branch1][C][O-1][O-1]"}]