ethyl N-(ethoxycarbonylacetyl)-N-benzylglycinate
ethyl 1-benzyl-2,4-dioxopyrrolidine-3-carboxylate
ethyl 2-(benzylamino)acetate
1-(phenylmethyl)pyrrolidine-2,4-dione
1-benzyl-4-(pyrrolidin-1'-yl)-3-pyrrolin-2-one
dimethyl 1-benzyl-6-hydroxy-2-oxo-2,7-dihydro-1H-azepine-4,5-dicarboxylate
methyl 1-benzyl-2,6-dioxo-2,3,4,5,6,7-hexahydro-1H-azepine-4-caboxylate
methyl 7-benzyl-3,6-dioxo-1,2,3,6,7,8-hexahydropyrazolo<3,4-c>azepine-4-carboxylate
dimethyl 1-benzyl-6-methoxy-2-oxo-2,7-dihydro-1H-azepine-4,5-dicarboxylate
dimethyl 1-benzyl-6-hydroxy-2-oxo-2,3,4,7-tetrahydro-1H-azepine-4,5-dicarboxylate