(1,2,4)Triazino(3,4-c)(1,4)benzoxazin-2(1H)-one, 3,5-dihydro-8-chloro- 139605-52-0 3,5-Dihydro-8-chloro-(1,2,4)triazino(3,4-c)(1,4)benzoxazin-2(1H)-one