CAS 7048-04-6 appears in our catalog under these names: L-Cysteine hydrochloride monohydrate, 99% , L-Cysteine hydrochloride monohydrate, 98.5-101.5% (dry basis. Offered by: Thermo Scientific (Alfa Aesar). Available pack sizes: 25g, 100g, 500g, 1kg, 5kg.