IUPAC Name: disodium;(3Z)-3-[(3-carboxy-5-methyl-4-oxidophenyl)-(2,6-dichlorophenyl)methylidene]-5-methyl-6-oxocyclohexa-1,4-diene-1-carboxylate Synonyms: Chromazurol B, Chrome Blue DSC, Fenakrom Blue XB, Chrome Sky Blue B, Durochrome Azurol B, Eriochrome Azurol B, Eriochromal Azurol B, Solochrome Azurine B, Diacromo Sky Blue B, Diamond Pure Blue B, Alizarol Azurine ECA, Chrome Fast Blue BX, Chromoxan Pure Blue B, Chrome Fast Blue GBX, Chromoxane Pure Blue B, Omega Carone Azurine B, Erio Chrome Azurole BA, Erio Chrome Azurole BC, Sunchromine Pure Blue B, Chromazine Pure Blue BX