CAS No 75522-93-9 , Benzoic acid,2-[2-[2-amino-6-[2-[4'-[2-[5-[2-(2,5-disulfophenyl)diazenyl]-1-hydroxy-6-(phenylamino)-3-sulfo-2-naphthalenyl]diazenyl]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]diazenyl]-5-hydroxy-7-sulfo-1-naphthalenyl]diazenyl]-5-nitro-,sodium salt (1:4)