Quality standard: USP30, CAS 52-90-4. L-cysteine is a sulphur-containing amino acid and a chiral intermediate of great industrial value. With an active sulfhydryl group, it offers reduction, antioxidant, chelating, cross-linking and modification functions and is widely used in pharmaceuticals, food, daily chemicals and fine-chemical synthesis; it can be used to prepare antibiotics, expectorants, amino acid infusions and peptide drug intermediates.
