1,3-Isobenzofurandione, 5,5'-((1-methylethylidene)bis(4,1-phenyleneoxy))bis- 159787-75-4 2,2-Bis(4-(3,4-dicarboxyphenoxy)phenyl)propane dianhydride 224302-28-7 38103-06-9 4,4'-((Isopropylidene)bis(p-phenyleneoxy))diphthalic dianhydride 74343-20-7 EINECS 253-781-7