[CH2:1]([O:3][CH2:4][CH2:5][NH2:6])[CH3:2].S=[C:8]1[CH2:12][S:11][C:10](=[O:13])[NH:9]1>C(O)C>[CH2:1]([O:3][CH2:4][CH2:5][NH:6][C:8]1[CH2:12][S:11][C:10](=[O:13])[N:9]=1)[CH3:2]To a solution of 2-ethoxyethanamine (4.07 g) in ethanol (100 mL) was added 4-thioxo-1,3-thiazolidin-2-one (4.05 g), and the mixture was stirred at room temperature overnight. The reaction mixture was concentrated, and the residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (4.90 g).
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