23611-69-0 2H-1,3-Benzoxazine-2,4(3H)-dione, 8-nitro-2-thio- 8-Nitro-2-thio-2H-1,3-benzoxazine-2,4(3H)-dione 8-Nitro-dihydro-1,3-benzoxazine-2-thione-4-one