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

Abstract

<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