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Methyl 2-(methylthio)benzoate

Methyl 2-(methylthio)butyrate

Methyl 2-(methylthio)propionate

Methyl 2-(n- phthalimidomethyl)-3-oxobutyrate

Methyl 2-(o-nitrobenzylidene)-acetoacetate

Methyl 2-(phenylmethoxy)-benzeneacetate

Methyl 2-(pyrrolidin-3-yl)acetate

Methyl 2-(trifluoromethyl)-3,3,3-trifluoropropionate

Methyl 2-(trifluoromethyl)acrylate

Methyl 2,2,3,3,4,4-hexafluorobutanoate

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