[NH2:1][C:2]1[NH:3][S:4](=[O:13])(=[O:12])[N:5]=[C:6]([CH2:8][CH2:9][S:10][CH3:11])[N:7]=1.ClC1C=CC=C(C(OO)=[O:22])C=1>CO.C(Cl)(Cl)Cl>[NH2:1][C:2]1[NH:3][S:4](=[O:13])(=[O:12])[N:5]=[C:6]([CH2:8][CH2:9][S:10]([CH3:11])=[O:22])[N:7]=1To a solution of 3-amino-5-[2-(methylthio)ethyl]-1,2,4,6-thiatriazine-1,1-dioxide (1.22 gm, 5.5 mmol) in warm methanol (20 ml) there was added dropwise a solution of 80% pure m-chloroperbenzoic acid (1.2 gm, 5.6 mmol) in chloroform (20 ml). The product crystallized from solution during the addition and was collected by filtration and washed with diethyl ether to give 1.27 gm of pure product, m.p. 180°-182° C.
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