[Cl:1][C:2]1[C:3]([OH:9])=[CH:4][C:5](=[O:8])[NH:6][CH:7]=1.[C:10](OCl)(=[O:14])[CH2:11][CH2:12][CH3:13]>>[C:10]([O:9][C:3]1[C:2]([Cl:1])=[CH:7][NH:6][C:5](=[O:8])[CH:4]=1)(=[O:14])[CH2:11][CH2:12][CH3:13]The general procedure of Example 3 was followed using 2.00 g of 5-chloro-4-hydroxy-2-pyridone and 2.20 g of butanoyloxy chloride, thereby producing 0.38 g of the title compound in a yield of 13%.
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