Synonyms: Naphtho[1,2-d]thiazolium,2-[3-[5,6-dichloro-1-ethyl-1,3-dihydro-3-(3-sulfobutyl)-2H-benzimidazol-2-ylidene]-1-propenyl]-1-(3-sulfopropyl)-,hydroxide, inner salt, sodium salt; Naphtho[1,2-d]thiazolium,2-[3-[5,6-dichloro-1-ethyl-1,3-dihydro-3-(3-sulfobutyl)-2H-benzimidazol-2-ylidene]-1-propenyl]-1-(3-sulfopropyl)-,inner salt, sodium salt (9CI); Naphtho[1,2-d]thiazolium,2-[3-[5,6-dichloro-1-ethyl-3-(3-sulfobutyl)-2-benzimidazolinylidene]propenyl]-1-(3-sulfopropyl)-,hydroxide, inner salt, sodium salt (8CI)