6H-Pyrimido(4,5-b)(1,4)benzothiazine, 7,8-dihydro-9-amino-7,7-dimethyl-4-(dimethylamino)-, hydrobromide 7,8-Dihydro-9-amino-7,7-dimethyl-4-(dimethylamino)-6H-pyrimido(4,5-b)(1,4)benzothiazine HBr 80761-73-5