CAS 51550-25-5 appears in our catalog under these names: Beryllon II/ 99.84% (existing batch purity), Beryllon II, Sodium 4,5-dihydroxy-3-((8-hydroxy-3,6-disulfonatonaphthalen-1-yl)diazenyl)naphthalene-2,7-disulfonate, Beryllon II, 98.0%. Offered by: TargetMol, GLPBio, Chemat, MedChemExpress. Available pack sizes: 500mg, 1g, 10mM (in 1ml dmso), 1 g, 500 mg, 10mM/1mL.