23611-67-8 2H-1,3-Benzoxazine-2,4(3H)-dione, 6,8-dichloro-2-thio- 6,8-Dichloro-2-thio-2H-1,3-benzoxazine-2,4(3H)-dione 6,8-Dichloro-dihydro-1,3-benzoxazine-2-thione-4-one