[OH:1][C:2]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[NH:5][C:4](=[O:12])[C:3]=1[C:13]([O:15]C)=O.[C:17]([NH2:21])([CH3:20])([CH3:19])[CH3:18]>C(O)C>[C:17]([NH:21][C:13]([C:3]1[C:4](=[O:12])[NH:5][C:6]2[C:11]([C:2]=1[OH:1])=[CH:10][CH:9]=[CH:8][CH:7]=2)=[O:15])([CH3:20])([CH3:19])[CH3:18]8.76 g (0.04 mol) of methyl 4-hydroxy-2-oxoquinoline-3-carboxylate was stirred with 3.7 g (0.05 mol) of tert-butylamine in 60 ml of ethanol in a miniautoclave for 8 hours at 150° C. under autogenous pressure. After cooling, the crystals were removed by suction filtration, washed with ligroin and dried.
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