A new 6,9′-cyclolignan from <i>Syringa pinnatifolia</i>

<div><p>A new lignan, 4,4′-dihydroxy-3,3′-dimethoxy-6,9′-cycloligna-7,8′-dien-9′-al, was isolated from the stem of <i>Syringa pinnatifolia</i> Hems1. var. <i>alashanensis</i> MA. et S.Q. Zhou (<i>S. pinnatifolia</i>). This is the first report on the structure elucidation of a new compound based on spectroscopic methods including UV, IR, ESI-MS, 1D NMR and 2D NMR techniques.</p></div

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

Structure elucidation and NMR assignments of a new 6,9-cyclotetrahydrofuranlignan from <i>Syringa pinnatifolia</i>

<p>A new 6,9-cyclotetrahydrofuranlignan, 3,3′-dimethoxy-4,4′-dihydroxy-8β,9β,8′α-6,9-cyclotetrahydrofuranlignan, was isolated from the stem of <i>Syringa pinnatifolia</i> Hems1.var. <i>alashanensis</i> MA. et S. Q. ZHOU. Its structures were elucidated on the basis of spectroscopic methods including UV, IR, ESI-MS, 1D NMR and 2D NMR.</p