“…Piper species produce a number of metabolic classes with diverse biological activities [ 10 ]. The essential oils extracted from different organs of many specimens is constituted mainly of monoterpene hydrocarbons (e.g., α-pinene, myrcene, limonene, α-terpinene, p -cymene), oxygenated monoterpenoids (e.g., 1,8-cineole, linalool, terpinen-4-ol, borneol, camphor), sesquiterpene hydrocarbons (e.g., β-caryophyllene, α-humulene, germacrene D, bicyclogermacrene, α-cubebene), oxygenated sesquiterpenoids (e.g., spathulenol, ( E )-nerolidol, caryophyllene oxide, α-cadinol, epi -α-bisabolol) and phenylpropanoids (e.g., safrole, dillapiole, myristicin, elemicin, ( Z )-asarone, eugenol) (see Appendix A and Appendix B ) [ 12 , 13 ].…”