N-(4-nitrophenyl)butanamide

2-ethyl-N-(4-nitrophenyl)malonamic acid ethyl ester

diethyl 2-ethyl-2-[2-(2-nitrophenyl)ethyl]propanedioate

5-ethyl-1-methyl-1,3-diazinane-2,4,6-trione

ethyl-(4-fluoro-butyl)-malonic acid diethyl ester