[{"from": "human", "value": "Could you provide a description of this molecule? [C][C][=Branch1][C][=O][N][C@@H1][Branch1][=Branch1][C][S][C][C][O][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a modified form of acetylcysteine that is a metabolite of ethylene oxide and may be found in the urine of smokers."}]