The isolation and antimicrobial activities of three monocylic sesquiterpenes from <i>Syringa pinnatifolia</i>

<div><p>We report the isolation of a new sesquiterpene, named as syripinol (<b>1</b>), and two known compounds from the volatile oil of the stems of <i>Syringa pinnatifolia</i>, for the first time. The structures of the isolated compounds were elucidated on the basis of spectroscopic methods including UV, IR, ESI-MS, 1D and 2D NMR techniques. The antibacterial activities of the compounds were also evaluated against various bacteria which showed good results.</p></div