[O:1]=[C:2]1[NH:7][N:6]=[C:5]([C:8]2[CH:16]=[CH:15][C:11]([C:12](O)=[O:13])=[CH:10][CH:9]=2)[CH2:4][CH2:3]1.S(Cl)([Cl:19])=O>ClCCl>[O:1]=[C:2]1[NH:7][N:6]=[C:5]([C:8]2[CH:16]=[CH:15][C:11]([C:12]([Cl:19])=[O:13])=[CH:10][CH:9]=2)[CH2:4][CH2:3]110 mmol (2.2 g) of 4-(1,4,5,6-tetrahydro-6-oxo-3-pyridazinyl)benzoic acid are suspended in 50 ml of dichloromethane, after which 1.5 ml (20 mmol) of thionyl chloride are added and the mixture is stirred for 24 hours while being boiled gently.
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