CN(C)C=[N:4][S:5]([C:8]1[S:20][C:11]2=[C:12]([O:16]C(=O)C)[N:13]=[CH:14][CH:15]=[C:10]2[CH:9]=1)(=[O:7])=[O:6].Cl>[OH-].[Na+].O>[S:5]([C:8]1[S:20][C:11]2[C:12](=[O:16])[NH:13][CH:14]=[CH:15][C:10]=2[CH:9]=1)(=[O:6])(=[O:7])[NH2:4]An initial suspension of N,N-dimethyl-N'-(7-acetoxythieno[2,3-c]pyridine-2-sulfonyl)formamidine (2.0 g, 6.1 mmol) in 10 N sodium hydroxide (4 ml) diluted with water (15 ml) was warmed at 60° C. for 1 hour. This clear solution was cooled and acidified with concentrated hydrochloric acid to give a precipitate of product. This precipitate (1.2 g) was collected by filtration and dried in a vacuum oven. Recrystallization by dissolution in a minimum amount of hot dimethyl sulfoxide, followed by dilution with ethanol gave 0.76 g (54% yield) of pure product; m.p. 295°-297° C.
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