4,6-bis(phenylcarbamoyl)benzene-1,3-dicarboxylic acid

pyromellitic acid dianilide para-isomer

1,2,4,5-苯四酰胺

5,5-bis(4-hydroxyphenyl)-3H-spiro[benzo[1,2-c:4,5-c']difuran-1,9'-xanthene]-3,7(5H)-dione

3,3,5,5-tetrakis(4-hydroxyphenyl)pyromellitide