3737290 -OEChem-02060822572D 0 0 0 0 0 0 0 0 0999 V2000 M END > 3737290 > 2 > ChemIDplus > 028157666 > 1H,3H-Benzo(1,2-c:4,5-c')difuran-1,3,5,7-tetrone, polymer with 1,4-benzenediamine and 5,5'-carbonylbis(1,3-isobenzofurandione) 28157-66-6 p-Phenylenediamine, pyromellitic dianhydride, 3,3',4,4'-benzophenonetetracarboxylic dianhydride polymer > 28157-66-6 > 028157666 > http://chem.sis.nlm.nih.gov/chemidplus/ > http://chem.sis.nlm.nih.gov/chemidplus/direct.jsp?result=advanced®no=028157666 $$$$