[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is an organophosphate oxoanion that is the dianion of ethyl phosphate arising from deprotonation of both OH groups of the phosphate. It has a role as an epitope, a phosphoantigen and a metabolite. It is a conjugate base of an ethyl hydrogen phosphate(1-)."}, {"from": "gpt", "value": "[C][C][O][P][=Branch1][C][=O][Branch1][C][O-1][O-1]"}]