Sesquiterpenes from the Endophyte Glomerella cingulata

Abstract

From the cultured endophytic fungus Glomerella cingulata isolated from a toxic plant, Gelsemium elegans, one new phenanthrene (1), four new sesquiterpenes (2-5), and three known sesquiterpenes (6-8) were isolated. Their structures were elucidated using spectroscopic methods. Based on the ECD calculations, the absolute configurations of the new compounds were determined. Compounds 2, 4, and 5 inhibited lipopolysaccharide (LPS)-induced NO production in BV2 cells by 50.6, 36.1, and 29.4%, respectively, at 1 μM (positive control curcumin, IC₅₀ = 4.0 μM).