[F:1][C:2]1[CH:7]=[CH:6][C:5]([N:8]2[C:13]3[CH:14]=[CH:15][C:16]([N:18](S(C)(=O)=O)[S:19]([CH3:22])(=[O:21])=[O:20])=[CH:17][C:12]=3[O:11][C:10]([CH3:28])([CH3:27])[C:9]2=[O:29])=[CH:4][CH:3]=1.[OH-].[Na+].Cl.CC(C)=O.O>CC(C)=O>[F:1][C:2]1[CH:3]=[CH:4][C:5]([N:8]2[C:13]3[CH:14]=[CH:15][C:16]([NH:18][S:19]([CH3:22])(=[O:20])=[O:21])=[CH:17][C:12]=3[O:11][C:10]([CH3:27])([CH3:28])[C:9]2=[O:29])=[CH:6][CH:7]=1To a suspension of N-[4-(4-fluorophenyl)-2,2-dimethyl-3-oxo-3,4-dihydro-2H-1,4-benzoxazin-7-yl]-N-(methylsulfonyl)methanesulfonamide (1 g) in acetone (3 mL) was added dropwise an aqueous sodium hydroxide solution (0.18 g/3 mL) at 25° C., and the mixture was stirred at the same temperature for 90 minutes. To the reaction mixture was added dropwise concentrated hydrochloric acid/acetone/water (0.24 g/0.5 mL/0.35 mL) at 25° C., and the mixture was stirred for 2 hours. The precipitated crystals were collected by filtration, washed with a solution of acetone/water (1:1.6 mL), and then dried under reduced pressure at 50° C. to obtain the title compound (0.79 g) as Form A crystals (yield: 95%, purity: 100%).
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