23611-68-9 2H-1,3-Benzoxazine-2,4(3H)-dione, 6,8-dibromo-2-thio- 6,8-Dibromo-2-thio-2H-1,3-benzoxazine-2,4(3H)-dione 6,8-Dibromo-dihydro-1,3-benzoxazine-2-thione-4-one