Perylene-3 4 9 10-tetracarboxylic acid July 8, 2019 16 32 64 128 Perylene 3 4 9 10 tetracarboxylic acid tetrapotassium salt Perylene 3 4 9 10 tetracarboxylic acid dianhydride Perylene 3 4 9 10 tetracarboxylic acid diimide