Constituents of a Fern, Davallia mariesii Moore. I. Isolation and Structures of Davallialactone and a New Flavanone Glucuronide

Abstract

A new γ-lactone derivative named davallialactone (4) and the 7-O-β-D-glucuronide of (±)-eriodictyol (5a) have been isolated from Davallia mariesii moore along with caffeic acid (1), 4-O-β-D-glucopyranosylcaffeic acid (2) and 4-O-β-D-glucopyranosyl->-coumaric acid (3). The structures of the new compounds were determined by chemical and spectroscopic methods including two-dimensional nuclear magnetic resonance (2D NMR) techniques, especially 1H-detected heteronuclear multiple-bond multiple-quantum coherence and long-range C-H J-resolved 2D NMR techniques. © 1990, The Pharmaceutical Society of Japan. All rights reserved.