[CH:1]1([N:4]2[C:13]3[N:12]=[C:11]4[CH:14]=[C:15](F)[C:16]([F:18])=[CH:17][C:10]4=[CH:9][C:8]=3[C:7](=[O:20])[C:6]([C:21]([OH:23])=[O:22])=[CH:5]2)[CH2:3][CH2:2]1.[CH3:24][N:25]1[CH2:30][CH2:29][NH:28][CH2:27][CH2:26]1.O.Cl>CS(C)=O>[CH:1]1([N:4]2[C:13]3[N:12]=[C:11]4[CH:14]=[C:15]([N:28]5[CH2:29][CH2:30][N:25]([CH3:24])[CH2:26][CH2:27]5)[C:16]([F:18])=[CH:17][C:10]4=[CH:9][C:8]=3[C:7](=[O:20])[C:6]([C:21]([OH:23])=[O:22])=[CH:5]2)[CH2:2][CH2:3]1A suspension of 0.47 g of 1-cyclopropyl-7,8-difluoro-4-oxo-1,4-dihydro-benzo[b][1,8]naphthyridine-3-carboxylic acid and 0.6 g of 1-methylpiperazine in 7 cm3 of dimethyl sulphoxide is heated at a temperature close to 80° C. for 15 minutes. The reaction mixture is poured into 25 cm3 of water and 9 cm3 of N hydrochloric acid are added. The solid obtained is drained and washed with 3 times 5 cm3 of water. After recrystallizing once from a mixture of 4.3 cm3 of ethanol and 4.5 cm3 of dimethylformamide, 0.29 g of 1-cyclopropyl-7-fluoro-8-(4-methyl-1-piperazinyl)-4-oxo-1,4-dihydro-benzo[b][1,8]naphthyridine-3-carboxylic acid is obtained in the form of a yellow solid melting at 250° C.
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