128-69-8 3,4,9,10-Perylenetetracarboxylic 3,4:9,10-dianhydride 3,4,9,10-Perylenetetracarboxylic dianhydride 3,4:9,10-Perylenetetracarboxylic anhydride NSC79895 Perylene-3,4,9,10-tetracarboxylic 3,4:9,10-dianhydride Perylene-3,4,9,10-tetracarboxylic dianhydride Perylenetetracarboxylic acid dianhydride Perylenetetracarboxylic anhydride Perylo[3,4-cd:9,10-c'd']dipyran-1,3,8,10-tetrone