Also Called: Naphthalenesulfonic acid, [(9,10-dihydro-9,10-dioxo- 1,4-anthracenediyl)diimino]bis[1,2,3,4-tetrahydro -, disodium salt;Naphthalenesulfonic acid, [(9,10-dihydro-9,10-dioxo-1,4-anthracenediyl)diimino]bis[1,2,3,4-tetrahydro-, disodium salt;Naphthalenesulfonic acid, [(9,10-dihydro-9,10-dioxo-1,4-anthracenediyl)diimino]bis[1,2,3,4-tetrahydro-, sodium salt (1:2)