A 10-year-old boy presents with lethargy and vomiting. His parent states the patient had 3 days of cough, rhinorrhea, sore throat, and fever, during which time the nanny had been giving the patient an effervescent over-the-counter medicine to help with his upset stomach. He seemed to be doing much better for a few days until this morning when he became confused and agitated, and he vomited. The physical exam is remarkable for lethargy, mild icterus, and hepatomegaly. Laboratory results include markedly elevated transaminase. Which medication is most likely responsible for this patient's presentation?

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