Synonyms: Benzenesulfonic acid, ((9,10-dihydro-9,10-dioxo-1,4-anthracenediyl)diimino)bis((4-chlorophenoxy)-, sodium salt (1:2);Benzenesulfonic acid, ((9,10-dihydro-9,10-dioxo-1,4-anthracenediyl)diimino)bis((4-chlorophenoxy)-, disodium salt;Disodium ar,ar'-((9,10-dihydro-9,10-dioxo-1,4-anthrylene)diimino)bis((4-chlorophenoxy)benzenesulphonate);sodium 2,13-dichloro-17,22-dioxo-15,17,22,24-tetrahydro-16,23-ethenotribenzo[b,e,m]naphtho[2,3-i][1,4,7,12]dioxadiazacyclotetradecine-6-sulfonate (1:1)