[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][=C][Branch2][Ring1][Ring1][C][=Branch1][C][=O][C][=Branch1][O][=C][N][Ring1][#Branch1][C][C][=Branch1][C][=O][O][I][I]"}, {"from": "gpt", "value": "The molecule is a 4-pyridone in which the pyridone is iodo-substituted at C-3 and -5 and has a carboxymethyl substituent on nitrogen; used as a radiocontrast agent urography. It has a role as a radioopaque medium. It is a member of 4-pyridones, a monocarboxylic acid and an organoiodine compound."}]