CAS 3520-42-1 appears in our catalog under these names: Acid Red 52, Sulforhodamine B Sodium Salt, Sulforhodamine B sodium salt/ 72% (existing batch purity), Sulforhodamine B sodium salt (Acid Red 52), Sulforhodamine B sodium salt . Offered by: Dr. Ehrenstorfer, TRC, TargetMol, GLPBio, Thermo Scientific (Alfa Aesar). Available pack sizes: 100mg, 1g, 5g, 25g, 100g, 50g, 250g, 500g.