Cl.[NH2:2][C@@H:3]([C:9]([OH:11])=[O:10])[CH2:4][CH2:5][CH2:6][CH2:7][NH2:8].S(Cl)([Cl:14])=O.[CH3:16]O>>[ClH:14].[CH3:16][NH:2][C@@H:3]([C:9]([OH:11])=[O:10])[CH2:4][CH2:5][CH2:6][CH2:7][NH2:8]In the first step, D-lysine monohydrochloride reacts with thionyl chloride in the presence of methanol to give methyl-D-lysinate hydrochloride.
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