[C:1]([NH:6][C@@H:7]([C:10]([OH:12])=[O:11])[CH2:8][SH:9])(=[O:5])[CH:2]([CH3:4])[CH3:3].OO>CO>[CH3:3][CH:2]([CH3:4])[C:1]([NH:6][C@H:7]([CH2:8][S:9][S:9][CH2:8][C@@H:7]([NH:6][C:1](=[O:5])[CH:2]([CH3:3])[CH3:4])[C:10]([OH:12])=[O:11])[C:10]([OH:12])=[O:11])=[O:5]N-isobutyryl-D-cysteine (1 g, 5.2 mmol) was dissolved in 10 ml of methanol. Hydrogen peroxide (30%, 0.3 ml, 2.6 mmol) was added and the reaction mixture was stirred at room temperature for 6 hours. After evaporation of the solvent under reduced pressure, a white crystallised oil was obtained. Recrystallisation from ethyl acetate furnished the title compound as a white solid which was dried in vacuo.
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