(+)-2-(3-methylbutyl)-4-oxooxetane-2-carboxylic acid

(2R)-2-hydroxy-2-(2-methoxy-2-oxoethyl)-5-methylhexanoic acid

(R)-2-acetoxy-2-(2-methoxy-2-oxoethyl)-5-methylhexanoic acid

(R)-benzyl 2-(2-methoxy-2-oxoethyl)-5,5-dimethyltetrahydrofuran-2-carboxylate

(R)-1-benzyl 4-methyl 2-hydroxy-2-(3-methylbut-2-enyl)succinate