Byakangelicol, isolated from Angelica dahurica, inhibits interleukin-1beta (IL-1beta) -induced prostaglandin E2 (PGE2) release in A549 cells mediated by suppression of cyclooxygenase-2 (COX-2) expression and the activity of COX-2 enzyme. Byakangelicol has therapeutic potential as an anti-inflammatory drug on airway inflammation^[1].