11,24-tetraoxidan-2-one

5-methylene-3-phenylimidazolidine-2,4-dione

2-methyl-5-oxo-[1,3]oxathiolane-2-carboxylic acid

5-hydroxy-3,5-dimethyl-5H-furan-2-one

1-(3-phenyloxiran-2-yl)ethanone