New chemical constituents of roots of Urtica triangularis HAND-MASS

Abstract

Studies on the chemical constituents of roots of Urtica triangularis HAND-MASS have led to the isolation of four new compounds. The structures, including the absolute configurations, of these constituents have been elucidated through spectral studies including 1H-NMR, 13C-NMR, 2D-NMR experiments (heteronuclear single-quantum coherence, heteronuclear multiple bonding connectivity and nuclear Overhauser effect spectroscopy), high resolution mass spectroscopy (HR-MS) and circular dichroism as (-)-4-methoxy-8′-acetyl olivil, (-)-4-methoxy-8′-acetyl olivil-4-O-α-arabinopyronosyl-(1→6)-β-glucopyranoside, (-)-olivil-9-O-β-glucopyranoside and cycloolivil-9-O-β- glucopyranoside. © 2008 Pharmaceutical Society of Japan.