[CH3:1][O:2][C:3]1[CH:11]=[CH:10][C:6]([C:7]([OH:9])=O)=[CH:5][CH:4]=1.[NH2:12][C:13]1[CH:22]=[CH:21][C:20]2[C:15](=[N:16][C:17]([S:23][CH3:24])=[CH:18][CH:19]=2)[N:14]=1.CC(O)C>O>[CH3:24][S:23][C:17]1[N:16]=[C:15]2[C:20]([CH:21]=[CH:22][C:13]([NH:12][C:7](=[O:9])[C:6]3[CH:5]=[CH:4][C:3]([O:2][CH3:1])=[CH:11][CH:10]=3)=[N:14]2)=[CH:19][CH:18]=1The procedure is similar to that described in Example 1, but starting with 4-methoxybenzoic acid (11.8 g), N,N'-carbonyldiimidazole (12.6 g) and 2-amino-7-methylthio-1,8-naphthyridine (9.6 g). The product produced by precipitation in water (15.8 g; m.p. 100° C.) is dissolved in boiling 2-propanol (180 cc). After 1 hour's cooling at 4° C., the crystallised solid is separated by filtration, washed with 2-propanol (10 cc) and then isopropyl ether (2×10 cc), and dried at 40° C. under reduced pressure (0.067 kPa . N-(7-methylthio-1,8-naphthyridin-2-yl)-4-methoxybenzamide (13.6 g) is produced, m.p. 130° C.
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