disodium 3,3'-(1,3,8,10-tetrahydro-1,3,8,10-tetraoxoanthra[2,1,9-def:6,5,10-d'e'f']diisoquinoline-2,9-diyl)bis[6-aminobenzenesulphonate];3,3'-[(1,3,8,10-Tetrahydro-1,3,8,10-tetraoxoanthra[2,1,9-def:6,5,10-d'e'f']diisoquinoline)-2,9-diyl]bis(6-aminobenzenesulfonic acid)disodium salt