[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule is an aromatic hydrocarbon comprised of glyoxylic acid where the aldehyde hydrogen is substituted by a phenyl group. Since phenylglyoxylic acid (PGA) is a metabolite of styrenes, the measurement of PGA in urine may be correlated to a subject's level of styrene exposure."}, {"from": "gpt", "value": "[C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][C][=Branch1][C][=O][C][=Branch1][C][=O][O]"}]