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

2-(methylsulfonyloxymethyl)butyl methanesulfonate

2-(acetylsulfanylmethyl)butanoic acid

2-(phenylhydrazinylidene)butanoic acid

ethyl 3-ethyl-2-oxopiperidine-3-carboxylate