[ClH:1].C([S:6][CH2:7][C@@:8]([CH3:13])([C:10]([OH:12])=[O:11])[NH2:9])(C)(C)C>>[ClH:1].[CH3:13][C@@:8]([C:10]([OH:12])=[O:11])([CH2:7][SH:6])[NH2:9]Conc. hydrochloric acid (345.3 g) was added to S-tert-butyl-α-methyl-L-cysteine (38.4 g, 201 mmol) produced by the method in EXAMPLE 11, and the resultant mixture was refluxed for 24 hours to obtain an aqueous solution of α-methyl-L-cysteine hydrochloride.
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