(1,1'-Biphenyl)-2,2'-disulfonic acid, 4,4'-bis((1-(((2,4-dimethylphenyl)amino)carbonyl)-2-oxopropyl)azo)-, calcium salt 85005-79-4 Calcium 4,4'-bis((1-(((2,4-dimethylphenyl)amino)carbonyl)-2-oxopropyl)azo)(1,1'-biphenyl)-2,2'-disulphonate EINECS 285-011-0