A New Xanthone Glycoside from the Endolichenic Fungus Sporormiella irregularis

Abstract

A new xanthone glycoside, sporormielloside (1), was isolated from an EtOAc extract of an endolichenic fungal strain Sporormiella irregularis (No. 71-11-4-1), along with two known xanthones (2, 3). Their structures were determined by detailed spectroscopic analysis (IR, MS, and 1D- and 2D-NMR), a chemical method, and a comparison of NMR data with closely related compounds previously reported. According to the structures of isolated compounds, their plausible biosynthetic pathway was deduced.

Keywords

• xanthone glycoside
• Sporormiella irregularis
• endolichenic fungus
• biosynthetic pathway