1,3-Benzenedicarboxylic acid, 5,5'-[(1,3,8,10-tetrahydro-1,3,8,10-tetraoxoanthra[2,1,9-def:6,5,10-d'e'f']diisoquinoline-2,9-diyl)diimino]bis-
1,3-Benzenedicarboxylic acid, 5,5'-[(1,3,8,10-tetrahydro-1,3,8,10-tetraoxoanthra[2,1,9-def:6,5,10-d'e'f']diisoquinoline-2,9-diyl)diimino]bis-