Cyclopentanone

Cyclopentanone is a colorless liquid organic compound with a peppermint-like odor. It is a cyclic ketone, structurally similar to cyclopentane, consisting of a five-membered ring containing a ketone functional group.

Safety
The compound is stable, but flammable; the vapour is denser than air by 2.3 times, and is explosive when combined with air. Cyclopentanone is harmful if swallowed, inhaled or absorbed through the skin. It is also irritant to the skin and respiratory system, and severely irritant to the eyes.