195740-21-7 2-Naphthalenecarboxylic acid, 4-((5-chloro-4-methyl-2-sulfophenyl)azo)-3-hydroxy-, magnesium salt (1:1) 4-((5-Chloro-4-methyl-2-sulfophenyl)azo)-3-hydroxy-2-naphthalenecarboxylic acid, magnesium salt 71832-83-2 EINECS 276-056-7 Magnesium 4-((5-chloro-4-methyl-2-sulphonatophenyl)azo)-3-hydroxy-2-naphthoate