1-[2-(1,3-dioxolan-2-yl)ethyl]pyrrolidin-2-one

4-(3,5-ditert-butyl-4-hydroxyphenyl)sulfanylbutanoic acid

3,5,6,7-tetrahydroinden-4-one

ethyl 4-pyrazol-1-ylbutanoate

ethyl 4-(4-phenylphenoxy)butanoate