[CH3:1][C:2]1([CH3:8])[NH:6][NH:5][C:4](=[O:7])[CH2:3]1.[ClH:9]>CCOCC>[ClH:9].[CH3:1][C:2]1([CH3:8])[NH:6][NH:5][C:4](=[O:7])[CH2:3]1A scintillation vial equipped with a stir bar was charged with 5,5-dimethyl-pyrazolidin-3-one (228 mg, 2.0 mmol) and 2.0 M HCl in Et2O (2 mL) was added. A white PPT formed. This was filtered and washed with further Et2O (20 mL). Amount obtained: 300 mg, 2.0 mmol, 100% yield. Step 3
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