2-Anthracenesulfonic acid, 1-amino-4-((4-((((2,3-dichloro-6-quinoxalinyl)sulfonyl)amino)sulfonyl)-2,6-dimethylphenyl)amino)-9,10-dihydro-9,10-dioxo-, monopotassium salt
2-Anthracenesulfonic acid, 1-amino-4-((4-((((2,3-dichloro-6-quinoxalinyl)sulfonyl)amino)sulfonyl)-2,6-dimethylphenyl)amino)-9,10-dihydro-9,10-dioxo-, monopotassium salt