Synonyms: 1H-Indol-3-ol,5-bromo-2-[9-chloro-3-(sulfooxy)naphtho[1,2-b]thien-2-yl]-, hydrogen sulfate(ester), dipotassium salt (9CI);Indol-3-ol,5-bromo-2-(9-chloro-3-hydroxynaphtho[1,2-b]thien-2-yl)-, bis(hydrogen sulfate)dipotassium salt (7CI);Dipotassium 5-bromo-2-[9-chloro-3-(sulphonatooxy)naphtho[1,2-b]thien-2-yl]-1H-indol-3-yl sulphate;