[N:1]1[C:14]2[NH:13][C:12]3[C:7](=[CH:8][CH:9]=[CH:10][CH:11]=3)[S:6][C:5]=2[N:4]=[CH:3][CH:2]=1.[OH:15]O>C(O)(=O)C>[N:1]1[C:14]2[NH:13][C:12]3[C:7](=[CH:8][CH:9]=[CH:10][CH:11]=3)[S:6](=[O:15])[C:5]=2[N:4]=[CH:3][CH:2]=1To 1,4-diaza-10H-phenothiazine (1 g, 5 mmoles) in acetic acid (15 ml) was added 50% hydrogen peroxide (1 ml). The mixture was stirred at 55° for 30 minutes. The mixture was evaporated to a small volume and the title compound crystallized out. The crystals were filtered, washed with acetic acid and air dried to yield 983 mg of the title compound, m.p. 261°-263°.
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