[C:1]([NH:9][C:10](=[CH:15][N:16]([CH3:18])C)[C:11]([O:13][CH3:14])=[O:12])(=[O:8])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.NC1[S:21][CH:22]=[CH:23][N:24]=1.Cl.O>C(O)(C)C>[C:1]([NH:9][C:10](=[CH:15][NH:16][C:18]1[S:21][CH:22]=[CH:23][N:24]=1)[C:11]([O:13][CH3:14])=[O:12])(=[O:8])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=110 g (39.5 mmol) of methyl 2-benzoylamino-3-dimethylaminoacrylate and 11.3 g (118 mmol) of 2-aminothiazole were dissolved at 40° C. in 200 ml of isopropanol. The solution was admixed with 3.96 ml (48 mmol) of concentrated hydrochloric acid within 5 minutes (min) and stirred for a further 60 min. 75 ml of deionized water were added, the suspension was cooled overnight and the crystallized product was filtered off.
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