calcium 4-[(2,5-dichloro-3-methyl-6-sulphonatophenyl)azo]-3-hydroxy-2-naphthoate 4-[(2,5-Dichloro-3-methyl-6-sulfophenyl)azo]-3-hydroxy-2-naphthalenecarboxylic acid calcium salt 2-Naphthalenecarboxylic acid, 4-((2,5-dichloro-3-methyl-6-sulfophenyl)azo)-3-hydroxy-, calcium salt (1:1) 2-Naphthalenecarboxylic acid, 4-(2-(2,5-dichloro-3-methyl-6-sulfophenyl)diazenyl)-3-hydroxy-, calcium salt (1:1) 4-((2,5-Dichloro-3-methyl-6-sulfophenyl)azo)-3-hydroxy-2-naphthalenecarboxylic acid, calcium salt (1:1) Einecs 267-723-3 Calcium 4-[(2,5-dichloro-3-methyl-6-sulfonatophenyl)azo]-3-hydroxy-2-naphthoate