2-(4-carboxybutyl)cyclopentan-1-one

2-(6-carbethoxyhexyl)-2-carbomethoxycyclopentanone

2-(4-carbethoxybutyl)cyclopent-2-en-1-one

acetic acid,[2-(5-hydroxypentyl)cyclopenten-1-yl] acetate

2-<7-<(methylsulfonyl)oxy>heptyl>-1-methoximino-2-cyclopentene