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N'-{(E)-[2-(1,3-BENZOTHIAZOL-2-YLSULFANYL)-4-OXO-4H-PYRIDO[1,2-A]PYRIMIDIN-3-YL]METHYLIDENE}-3-NITROBENZOHYDRAZIDE N'-{(E)-[2-(1,3-BENZOTHIAZOL-2-YLSULFANYL)-4-OXO-4H-PYRIDO[1,2-A]PYRIMIDIN-3-YL]METHYLIDENE}-3-NITROBENZOHYDRAZIDE