Synonyms: Benzo[1,2-b:4,5-b']bis-p-dithiin-2,3,7,8-tetracarboxylic2,3:7,8-diimide, 5,10-dihydro-5,10-dioxo- (8CI);Benzo[1'',2'':5,6:4'',5'':5',6']bis[1,4]dithiino[2,3-c:2',3'-c']dipyrrole-1,3,5,7,9,11-hexone(9CI); Benzo[1,2-b:4,5-b']bis[1,4]dithiin-2,3,7,8-tetracarboxylic2,3:7,8-diimide, 5,10-dihydro-5,10-dioxo-;Benzo[1'',2'':5,6:4'',5'':5',6']bis-p-dithiino[2,3-c:2',3'-c']dipyrrole-1,3,5,7,9,11-hexone