1-Amino-4-((2-sulfo-p-tolyl)azo)-2-naphthalenesulfonic acid, calcium salt (1:1) 2-Naphthalenesulfonic acid, 1-amino-4-((4-methyl-2-sulfophenyl)azo)-, calcium salt (1:1) 65152-20-7 Calcium 1-amino-4-((4-methyl-2-sulphonatophenyl)azo)naphthalene-2-sulphonate EINECS 265-571-2