C(OC([N:8]1[C@H:12]([C:13]([NH2:15])=[O:14])[CH2:11][S:10][CH2:9]1)=O)(C)(C)C.[ClH:16].O1CCOCC1>>[ClH:16].[S:10]1[CH2:11][C@@H:12]([C:13]([NH2:15])=[O:14])[NH:8][CH2:9]1(4R)-3-(tert-Butyloxycarbonyl)thiazolidine-4-carboxamide (8.6 g, 37.1 mmol) was dissolved in 4M HCl/dioxan (50 ml). After 1 h at room temperature the solvent was evaporated in vacuo to give a white solid identified as the title compound (6.2 g, 36.8 mmol, 99%).
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