2-Naphthalenecarboxylic acid, 4-((3-chloro-2-methyl-5-sulfophenyl)azo)-3-hydroxy-, calcium salt (1:1) 4-((3-Chloro-2-methyl-5-sulfophenyl)azo)-3-hydroxy-2-naphthalenecarboxylic acid, calcium salt (1:1) 67892-40-4 Calcium 4-((3-chloro-2-methyl-5-sulphonatophenyl)azo)-3-hydroxy-2-naphthoate EINECS 267-572-3