1-Naphthalenesulfonic acid, 2-(2-(2-hydroxy-1-naphthalenyl)diazenyl)-, strontium salt (2:1);1-Naphthalenesulfonic acid, 2-((2-hydroxy-1-naphthalenyl)azo)-, strontium salt (2:1);Strontium 2-((2-hydroxy-1-naphthyl)azo)naphthalenesulphonate(1:2);strontium bis{2-[(2E)-2-(2-oxonaphthalen-1(2H)-ylidene)hydrazinyl]naphthalene-1-sulfonate}
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