[S:1]([C:5]1[S:16][C:8]2[CH2:9][N:10](C(=O)C)[CH2:11][CH2:12][C:7]=2[CH:6]=1)(=[O:4])(=[O:3])[NH2:2].Cl.C(=O)([O-])[O-].[Na+].[Na+].C(OCC)(=O)C.CO>[OH-].[Na+]>[S:1]([C:5]1[S:16][C:8]2[CH2:9][NH:10][CH2:11][CH2:12][C:7]=2[CH:6]=1)(=[O:3])(=[O:4])[NH2:2]A suspension of 2-sulfamoyl-6-acetyl-4,5,6,7-tetrahydrothieno[2,3-c]pyridine (9.61 g, 37 mmol) in 20% sodium hydroxide solution (75 ml) was warmed at 80° C. for 3 hours. The resultant clear solution was cooled, acidified with concentrated hydrochloric acid, and then made basic with saturated sodium carbonate solution. The product was isolated by exhaustive extraction into ethyl acetate/methanol. The dried solution was evaporated to give 7.36 g (91% yield) of product. Recrystallization from ethyl acetate/methanol gave pure product; m.p. 172°-175° C.
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