2-[5-oxo-4-(2-oxo-2-prop-2-enoxyethyl)-1,3-dioxolan-4-yl]acetic acid

2-[5-oxo-4-[2-oxo-2-(4-sulfamoylanilino)ethyl]-1,3-dioxolan-4-yl]acetic acid

2-[4-(2-methoxy-2-oxoethyl)-5-oxo-1,3-dioxolan-4-yl]acetate

3-hydroxy-5-oxo-5-phenylmethoxy-3-phenylmethoxycarbonylpentanoate

2-oxo-6-phenyl-2H-pyran-4-carboxylic acid