Synonyms: Pigment Red 224;3,4,9,10-Perylenetetracarboxylic aciddianhydride;3,4:9,10-Perylenetetracarboxylic anhydride;Perylo[3,4-cd:9,10-c'd']dipyran-1,3,8,10-tetrone;C.I. Pigment Red 224;Irgazin Red BPT;Irgazin Red BPTN;NSC 79895;PTCDA;Perrindo Red R 6420;Perylenetetracarboxylic acid dianhydride;Perylenetetracarboxylic dianhydride;