[CH2:1]([N:4]([CH2:10][CH:11]=O)[C:5](=[O:9])[O:6][CH2:7][CH3:8])[CH:2]=[CH2:3].[C:13]1([NH:19][CH2:20]C(O)=O)[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1>C1(C)C=CC=CC=1>[C:13]1([N:19]2[CH2:20][CH2:3][CH:2]3[CH:11]2[CH2:10][N:4]([C:5]([O:6][CH2:7][CH3:8])=[O:9])[CH2:1]3)[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=18.6 g (50 mmol) of ethyl N-allyl-N-(2-oxoethyl) -carbamate and 7.6 50 mmol) of phenylglycine are heated under reflux overnight in 200 ml of toluene. The mixture is decanted from resinous material and concentrated, and the residue is distilled.
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