Cl[CH2:2][CH:3]=[O:4].[CH3:5][C:6]1[N:11]=[C:10]([NH:12][C:13](=[S:15])[S-:14])[CH:9]=[CH:8][CH:7]=1.C([NH+](CC)CC)C.C(O)C>O>[OH:4][CH:3]1[CH2:2][S:15][C:13](=[S:14])[N:12]1[C:10]1[CH:9]=[CH:8][CH:7]=[C:6]([CH3:5])[N:11]=1A 50% aqueous solution of chloroacetaldehyde (28.4 g) is added, at between 20° and 30° C., to a solution of triethylammonium 6-methylpyrid-2-yldithiocarbamate (51.5 g) in distilled water (225 cc). The reaction mixture is stirred for 2 hours at 25° C. The crude product is filtered off, washed five times with distilled water (total 125 cc) and dried in air. The product obtained (37.0 g; m.p. 128° C.) is dissolved in boiling ethanol (250 cc). After filtering the boiling solution and cooling the filtrate for 2 hours at 2° C., the resulting crystals are filtered off, washed three times with ice-cooled ethanol (total 30 cc) and dried under reduced pressure (0.2 mm Hg) at 40° C. 4-Hydroxy-3-(6-methylpyrid-2-yl)-thiazolidine-2-thione (29.8 g), melting at 128° C., is thus obtained.
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