Note: A new iridoid diglycoside from Clerodendrum chinense

Abstract

A new iridoid diglucoside, 5-O-β-glucopyranosyl-harpagide, has been isolated from the aerial part of Clerodendrum chinense together with three known iridoid glucosides and six known cyclohexylethanoids. Their structures have been determined by analyses of spectroscopic data.

Keywords:

• Clerodendrum chinense
• Clerodendrum fragrans
• Verbenaceae
• Iridoid glucoside
• 5-O-β-Glucopyranosyl-harpagide
• Cyclohexylethanoid

Acknowledgements

We are grateful for the use of NMR facilities at the Research Center for Molecular Medicine, Hiroshima University, Japan. Also, we thank Ms. Wadee Ramruay of the Department of Pharmacognosy, Mahidol University, Thailand, for help in obtaining the plant material.