3-(benzylamino)cyclopent-2-en-1-one

3-pyrrolidin-1-ylcyclopent-2-en-1-one

5-hydroxy-5-(2-hydroxy-5-oxocyclopenten-1-yl)-1,3-diazinane-2,4,6-trione

3-hydroxy-2-phenylsulfanylcyclopent-2-en-1-one

3-羟基-2-苯基-2-环戊烯酮