2-Naphthalenecarboxylic acid, 4-((4-chloro-3-methyl-2-sulfophenyl)azo)-3-hydroxy-, calcium salt (1:1) 4-((4-Chloro-3-methyl-2-sulfophenyl)azo)-3-hydroxy-2-naphthalenecarboxylic acid, calcium salt (1:1) 68025-61-6 Calcium 4-((4-chloro-3-methyl-2-sulphonatophenyl)azo)-3-hydroxy-2-naphthoate EINECS 268-202-3