Synonyms: (1,1'-Biphenyl)-4-carboxamide, 4',4'''-(1,2-diazenediyl)bis(N-(9,10-bis(sulfooxy)-1-anthracenyl)-, sodium salt (1:4);(1,1'-Biphenyl)-4-carboxamide, 4',4'''-azobis(N-(9,10-bis(sulfooxy)-1-anthracenyl)-, tetrasodium salt;Tetrasodium 1,1'-(((4',4'''-azobis(1,1'-biphenyl)-4,4''-diyl)dicarbonyl)diamino)bis(anthracene-9,10-diyl) tetrasulphate;tetrasodium (E)-diazene-1,2-diylbis[(4-phenylcyclohexa-2,4-diene-1,1-diyl)carbonyliminoanthracene-1,9,10-triyl] tetrasulfate