5 6-diaminobenzene-1 2 3 4-tetracarbonitrile July 8, 2019 16 32 64 128 5 6 diaminobenzene 1 2 3 4 tetracarbonitrile 4 5-dimethylbenzene-1 2-diamine 2 5-diiodobenzene-1 4-diamine 4 5-dibromobenzene-1 2-diamine Benzene-1 2 4 5-tetracarboxylic dianhydride
