[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][C][=Branch1][C][=O][N][C][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is an isoform of methylhippuric acid where the methyl and glycine groups are bound to carbon-1 and carbon-4 on the benzene ring, respectively. Since 4-methylhippuric acid (4-MHA) is a metabolite of p-xylene, the measurement of 4-MHA in urine may be correlated to a subject's level of xylene exposure."}]