CAS 28300-74-5 appears in our catalog under these names: Potassium antimonyl tartrate trihydrate/ 99.5+%, Antimonyl potassium tartrate trihydrate (Potassium antimonyl tartrate trihydrate), Antimony potassium tartrate trihydrate, ACS, 99.0-103.0% , Antimony potassium tartrate trihydrate, Potassium antimonyl tartrate trihydrate, 99+%. Offered by: Chemat, GLPBio, Thermo Scientific (Alfa Aesar), Biosynth, Thermo Scientific (Acros). Available pack sizes: 100g, 500g, 100mg, 10mM (in 1ml water), 25g, 10g, 2.5KG, 50g.