Piperitone is a p-menthane monoterpenoid that is cyclohex-2-en-1-one substituted by a methyl group at position 3 and an isopropyl group at position 6. It has a role as a volatile oil component and a plant metabolite. It is a p-menthane monoterpenoid and a cyclic terpene ketone. Piperitone has insecticidal activity, it inhibited the development of newly laid eggs and of neonate larvae, but was less toxic than the crude extract to individuals developing inside the seeds. Piperitone reduces the nitrofurantoin resistance of strains of enterobacteriaceae.