(1,2,4)Triazino(3,4-c)(1,4)benzothiazin-2(1H)-one, 3,5-dihydro-5-methyl- 139605-59-7 3,5-Dihydro-5-methyl-(1,2,4)triazino(3,4-c)(1,4)benzothiazin-2(1H)-one