[C:1]12[C:7](=[CH:8][CH:9]=[CH:10][CH:11]=1)[NH:6]C(=O)[O:4][C:2]2=O.[CH:13]([NH2:16])([CH3:15])[CH3:14]>O>[NH2:6][C:7]1[CH:8]=[CH:9][CH:10]=[CH:11][C:1]=1[C:2]([NH:16][CH:13]([CH3:15])[CH3:14])=[O:4]A round-bottomed flask was charged with isatoic anhydride (5.0 g, 0.030 mol) and 30 mL water. Isopropylamine (4.64 mL, 0.049 mol) was added slowly to the reaction mixture. The product precipitated from the reaction mixture. After 1 h, the reaction mixture was filtered and washed with water to give 4.12 g (71% yield) of a white solid
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