1,2,4,5-Benzenetetracarboxylic 1,2:4,5-diimide, N,N'-bis(o-chlorophenyl)- 6626-72-8 Benzo[1,2-c:4,5-c']dipyrrole-1,3,5,7(2H,6H)-tetrone, 2,6-bis(2-chlorophenyl)- NSC58280