CN.CO[C:5]1[C:9]([NH:10][CH3:11])=[N:8][S:7](=[O:12])[N:6]=1.[CH3:13][N:14]([CH2:16][C:17]1[O:21][C:20]([CH2:22][S:23][CH2:24][CH2:25][NH2:26])=[CH:19][CH:18]=1)[CH3:15]>>[CH3:15][N:14]([CH2:16][C:17]1[O:21][C:20]([CH2:22][S:23][CH2:24][CH2:25][NH:26][C:5]2[C:9]([NH:10][CH3:11])=[N:8][S:7](=[O:12])[N:6]=2)=[CH:19][CH:18]=1)[CH3:13]Reaction of a methanolic solution of 3,4-dimethoxy-1,2,5-thiadizole 1-oxide [prepared in Example 4, Step A] with one equivalent of methylamine and treatment of the resultant 3-methoxy-4-methylamino-1,2,5-thiadiazole 1-oxide with one equivalent of 2-[(5-dimethylaminomethyl-2-furyl)methylthio]ethylamine yields the title compound, which is identical to the product prepared in Example 18.
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