[F:1][C:2]1[CH:7]=[CH:6][C:5]([I:8])=[CH:4][C:3]=1[N:9]1[CH:14]=[C:13]([O:15][CH3:16])[C:12](=[O:17])[C:11]([C:18]([O:20]C)=[O:19])=[N:10]1.[OH-].[Na+].Cl>CO>[F:1][C:2]1[CH:7]=[CH:6][C:5]([I:8])=[CH:4][C:3]=1[N:9]1[CH:14]=[C:13]([O:15][CH3:16])[C:12](=[O:17])[C:11]([C:18]([OH:20])=[O:19])=[N:10]1To a suspension of methyl 1-(2-fluoro-5-iodophenyl)-5-methoxy-4-oxo-1,4-dihydropyridazine-3-carboxylate (11.3 g, 28.1 mmol) in MeOH (112 mL) was added 1 M NaOH aqueous solution (56 mL) at 0° C. The mixture was stirred at room temperature for 90 min. To the mixture was added 1 M HCl aqueous solution (56 mL) at 0° C. The mixture was concentrated in vacuo. The precipitates were collected by filtration, washed with water and dried in vacuo at 60° C. to yield the title compound (9.96 g, 91% yield) as a yellow solid: NMR (DMSO-d6, 300 MHz): δ ppm 3.88 (3H, s), 7.42 (1H, dd, J=10.6, 8.7 Hz), 8.00 (1H, ddd, J=8.7, 4.5, 2.3 Hz), 8.16 (1H, dd, J=7.2, 2.3 Hz), 8.85 (1H, s), 14.86 (1H, brs).
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