A new diterpenoid glucopyranoside from Erythrophleum fordii

A phytochemical investigation of the bark of Erythrophleum fordii furnished six compounds, of which one is a new diterpenoid glucopyranoside, named 15Z-[dodecahydro-18-hydroxymethyl-17,19,20-trimethyl-15(1H)-phenanthrenylidene]-acetic acid-16-O-beta-D-glucopyranoside (1). Five known compounds were identified as (+)-taxifolin (2), (-)-robinetinidol (3), palmaitic acid (4), beta-sitosterol (5) and baucosteyl (6), and were all isolated from the species for the first time. The structure of the new compound was elucidated on the basis of spectroscopic analyses and chemical methods.