New grayanol diterpenoid and new phenolic glucoside from the flowers of Pieris formosa

Abstract

A new grayanol diterpenoid, grayanotoxin XXII (1), and a new phenolic glucoside, benzyl 2-hydroxy-4-O-[β-xylopyranosyl(1″ → 6′)-β-glucopyranosyl]-benzoate (2), were isolated from the flowers of Pieris formosa. Their structures were determined on the basis of spectroscopic analysis and chemical methods.

Keywords:

• grayanol diterpenoid
• phenolic glucoside
• Pieris formosa
• Ericaceae

Acknowledgements

We gratefully acknowledge the support for this research work by the National Natural Science Foundation of China (20862011), the Fok Ying Tong Education Foundation (111040), and the Foundation for the Author of National Excellent Doctoral Dissertation of China (200780).