A new acetophenone derivative from Rhododendron irroratum subsp. pogonostylum

One previously undescribed acetophenone derivative, named as rhodoirroratin (1), was isolated from Rhododendron irroratum subsp. pogonostylum along with four known compounds (2–5), which were isolated from the genus for the first time. Their structures were elucidated on the basis of extensive spectroscopic analysis, and the absolute configuration of compound 1 was assigned by the calculated NMR analysis. Compounds 1–3 had effects on LPS-induced NO release in RAW264.7 cells.