CAS 50-81-7 appears in our catalog under these names: L-(+)-Ascorbic acid, 98+% , L-(+)-Ascorbic acid, ACS, 99+% , L-(+)-Ascorbic acid, 99+% , L-(+)-Ascorbic acid, Electrophoresis Grade, 99+% . Offered by: Thermo Scientific (Alfa Aesar). Available pack sizes: 100g, 500g, 2kg, 25g, 2500g, 50g.