Acetaminophen (APAP) (4′-hydroxyacetanilide), N-acetyl-L-cysteine (NAC), 7-hydroxycoumarin (7-HC), and 7-methoxycoumarin (7-MC) were obtained from Tokyo Chemical Industry (Tokyo, Japan). 1-Phenyl-2-thiourea (PTU) was purchased from Sigma-Aldrich (St. Louis, MO, USA). All other chemicals were commercially available products of special reagent grade.
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