(1,1'-Biphenyl)-3,3'-dicarboxylic acid, 4-((5-((5-(aminosulfonyl)-2-hydroxyphenyl)azo)-1-hydroxy-6-(phenylamino)-3-sulfo-2-naphthalenyl)azo)-4'-((1-(((3-carboxy-4-hydroxyphenyl)amino)carbonyl)-2-oxopropyl)azo)-, tetrasodium salt 72252-59-6 EINECS 276-539-2