L-Cysteine HCL Monohydrate
The L-cystine was dissolved in dilute hydrochloric acid, added tin granules and heated to reflux for 2 hours. The remaining tin particles in the reducing solution were filtered and diluted with water, and then saturated with hydrogen sulphide. Filtration and filtration were carried out with a small amount of water ; Combined wash and filtrate, concentrated by vacuum, cooling crystallization, separation, drying in L-cysteine hydrochloride.
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