1,3-Isobenzofurandione, 4,5,6,7-tetrabromo- 3,4,5,6-Tetrabromophthalic anhydride 632-79-1 Bromphthal Dion 6692 FG 4000 FireMaster PHT 4 NSC4874 Phthalic anhydride, tetrabromo- Tetrabromophthalic anhydride