4-Acetamidophenyl acetate, an impurity of Acetaminophen, which is a selective COX-2 inhibitor (IC50: 25.8 μM) and a potent hepatic N-acetyltransferase 2 (NAT2) inhibitor.
4-Hydroxyacetophenone oxime is an impurity of Acetaminophen (Paracetamol), a potent COX-2 and hepatic NAT2 inhibitor used as an antipyretic and analgesic drug.