2-Naphthalenecarboxylic acid, 4-((5-chloro-4-methyl-2-sulfophenyl)azo)-1-hydroxy-, calcium salt (1:1) 4-((5-Chloro-4-methyl-2-sulfophenyl)azo)-1-hydroxy2-naphthalenecarboxylic acid, calcium salt (1:1) 83400-26-4 Calcium 4-((5-chloro-4-methyl-2-sulphonatophenyl)azo)-1-hydroxy-2-naphthoate EINECS 280-443-6