3-(3-(benzylamino)propyl)cyclopent-2-en-1-yl acetate

3-(3'-hydroxypropyl)-2-cyclopenten-1-one

3-(3-oxocyclopent-1-en-1-yl)propyl 4-methylbenzenesulfonate

acetic acid 3-[3-(toluene-4-sulfonyloxy)-propyl]-cyclopent-2-enyl ester