1,3-Isobenzofurandione, 5-nitro- 4-NITROPHTHALIC ANHYDRIDE 4-Nitrophthalic acid anhydride 5-17-11-00267 (Beilstein Handbook Reference) 5-Nitro-1,3-isobenzofurandione 5466-84-2 BRN 0179682 CCRIS 4684 EINECS 226-776-2 NSC 26424 Phthalic anhydride, 4-nitro-