3,3'-(1,3,5,7-tetraoxo-5,7-dihydro-1H,3H-pyrrolo[3,4-f]isoindole-2,6-diyl)-bis-benzoic acid

3,3'-(1,3,5,7-tetraoxo-5,7-dihydro-1H,3H-pyrrolo[3,4-f]isoindole-2,6-diyl)-bis-benzoic acid · CAS 37881-82-6