6-cyanohex-2-ynyl mesylate

4-<2-(methoxycarbonyl)ethyl>tetrahydrofura-2-one

3-(5-oxo-tetrahydro-furan-3-yl)-propionic acid

cis-hexahydro-1H-cyclopentafuran-1,6-dione

3-(hydroxymethyl)-2-(methoxycarbonyl)cyclopentanone