(1,1'-Biphenyl)-4-carboxamide, 4',4'''-azobis(N-(9,10-bis(sulfooxy)-1-anthracenyl)-, tetrasodium salt 71720-85-9 EINECS 275-913-2 Tetrasodium 1,1'-(((4',4'''-azobis(1,1'-biphenyl)-4,4''-diyl)dicarbonyl)diamino)bis(anthracene-9,10-diyl) tetrasulphate