5-Nitro-2H-1,4-benzoxazin-3(4H)-one; 5-NITRO-2H-BENZO[B][1,4]OXAZIN-3(4H)-ONE; 5-Nitro-3,4-dihydro-2H-1,4-benzoxazin-3-one; 5-Nitro-4H-benzo[1,4]oxazin-3-one;