2-Naphthalenecarboxylic acid, 4-(2-(5-chloro-4-methyl-2-sulfophenyl)diazenyl)-1-hydroxy-, strontium salt (1:1);4-((5-Chloro-4-methyl-2-sulfophenyl)azo)-1-hydroxy2-nephthalenecarboxylic acid, strontium salt (1:1);2-Naphthalenecarboxylic acid, 4-((5-chloro-4-methyl-2-sulfophenyl)azo)-1-hydroxy-, strontium salt (1:1);Strontium 4-((5-chloro-4-methyl-2-sulphonatophenyl)azo)-1-hydroxy-2-naphthoate (1:1);strontium (4E)-4-[2-(5-chloro-4-methyl-2-sulfonatophenyl)hydrazinylidene]-1-oxo-1,4-dihydronaphthalene-2-carboxylate
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