C([O:4][CH2:5][C:6]1[NH:7][CH:8]=[C:9]([S:13]C(C)(C)C)[C:10](=[O:12])[CH:11]=1)(=O)C.[ClH:18]>>[ClH:18].[OH:4][CH2:5][CH:6]1[CH:11]=[C:10]([OH:12])[C:9]([SH:13])=[CH:8][NH:7]1A mixture of {5-[(1,1-dimethylethyl)thio]-4-oxo-1,4-dihydro-2-pyridinyl}methyl acetate (240 mg, 0.94 mmol) and concentrated hydrochloric acid (2 ml) was heated to 80° C. overnight. The solvent was evaporated affording a pale yellow solid.
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