1,3-Isobenzofurandione, 4-(4-(1-(4-((1,3-dihydro-1,3-dioxo-5-isobenzofuranyl)oxy)phenyl)-1-methylethyl)phenoxy)- 2-(4-(2,3-Dicarboxyphenoxy)phenyl)-2-(4-(3,4-dicarboxyphenoxy)phenyl)propane dianhydride 53196-94-4