83249-31-4 EINECS 280-299-4 Tetrasodium 2,2'-((4,4'-bis((4,5-dihydro-5-imino-3-methyl-1-(8-sulphonato-2-naphthyl)-1H-pyrazol-4-yl)azo)(1,1'-biphenyl)-3,3'-diyl)bis(oxy))bisacetate