IUPAC Name: trisodium;chromium;3-hydroxy-4-[(2-hydroxynaphthalen-1-yl)diazenyl]-7-nitronaphthalene-1-sulfonate Synonyms: ACID BLACK 52, 5610-64-0, Palatine Fast Black WAN, trisodium;chromium;4-[(2-hydroxynaphthalen-1-yl)hydrazinylidene]-7-nitro-3-oxonaphthalene-1-sulfonate, Acid Black 52, tech., DTXSID40873917, MFCD00013214, AKOS025310856, ACID BLACK 52 (CHROMOLAN BLACK NWA), trisodium;chromium;3-hydroxy-4-[(2-hydroxynaphthalen-1-yl)diazenyl]-7-nitronaphthalene-1-sulfonate