1,3-Dioxy-4,5,6,7-tetrachloroisobenzofuran 1,3-Isobenzofurandione, 4,5,6,7-tetrachloro- 117-08-8 204975-24-6 4,5,6,7-Tetrachloro-1,3-isobenzofurandione 5-17-11-00260 (Beilstein Handbook Reference) AI3-09048 BRN 0211560 CCRIS 6202 CP 626 EINECS 204-171-4 HSDB 2922 NCI-C61585 NSC 1484 Niagathal Phthalic anhydride, tetrachloro- TETRACHLOROPHTHALIC ANHYDRIDE Tetrathal