[OH:1][CH:2]1[NH:6][C:5](=[O:7])[CH:4]=[CH:3]1>C(O)CCC>[CH2:2]([O:1][CH:2]1[NH:6][C:5](=[O:7])[CH:4]=[CH:3]1)[CH2:3][CH2:4][CH3:5]A mixture of 2.5 g of 1,5-dihydro-5-hydroxy-2H-pyrrol-2-one in 75 cm3 of 1-butanol and 1.3 g of Amberlite IR 120 H is heated to 70° C. for 2 hours. After allowing to return to ambient temperature, the residue is filtered and the solvent is evaporated under reduced pressure. 3.9 g of the expected product is obtained.
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