Chemical constituents and anti-inflammatory investigation of Elsholtzia rugulosa Hemsl

Two undescribed furan derivatives elsholtzia ketone-9-O-β-glucopyranoside (1) and 8-hydroxy-elsholtzia ketone-9-O-β-glucopyranoside (2) along with ten known compounds (3-12), were isolated from Elsholtzia rugulosa Hemsl. Their structures were elucidated based on extensive analyses of spectroscopic data and quantum chemical calculations. Anti-inflammatory experiments showed that 1, 7, and 12 reduce the production of nitric oxide (NO) and the levels of tumor necrosis factor-alpha (TNF-α), interleukin-1 beta (IL-1β), and interleukin-6 (IL-6) induced by lipopolysaccharide (LPS) in RAW264.7 cells.