CAS 556-50-3 appears in our catalog under these names: Glycylglycine, 99% , Glycylglycine, 98.5+%, Thermo Scientific , Glycylglycine, 0.2M buffer soln., pH 8.5 , Glycylglycine, 0.2M buffer sol . Offered by: Thermo Scientific (Alfa Aesar). Available pack sizes: 25g, 100g, 500g, 1kg, 100ml, 250ml.