Cl.[CH3:2][O:3][C:4]1[CH:5]=[C:6]([CH:9]=[CH:10][C:11]=1[O:12][CH3:13])[CH2:7][NH2:8].[Cl:14][C:15]1[C:16](=[O:25])[N:17]([CH2:22][CH2:23][CH3:24])[N:18]=[CH:19][C:20]=1Cl.C(=O)([O-])[O-].[K+].[K+].O1CCOCC1>O>[Cl:14][C:15]1[C:16](=[O:25])[N:17]([CH2:22][CH2:23][CH3:24])[N:18]=[CH:19][C:20]=1[NH:8][CH2:7][C:6]1[CH:9]=[CH:10][C:11]([O:12][CH3:13])=[C:4]([O:3][CH3:2])[CH:5]=1A mixture comprising 1.52 g of 3,4-dimethoxybenzylamine hydrochloride prepared in Reference Example 1, 0.62 g of 4,5-dichloro-2-n-propyl-3(2H)pyridazinone, 1.66 g of potassium carbonate, 10 ml of 1,4-dioxane and 30 ml of water was refluxed under stirring for 5 hours. The solvent was distilled off under reduced pressure, and water was added to the residue thereby obtained, and the mixture was extracted with ethyl acetate. The extract was washed successively with 2% diluted hydrochloric acid, water and a saturated sodium chloride aqueous solution, and dried over sodium sulfate, and then the solvent was distilled off to obtain a pale yellow oily substance. This substance was crystallized from diethyl ether-n-hexane to obtain 522 mg of the above identified compound having a melting point of from 139 to 140° C. as colorless crystals.
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