Min HY, Kim MS, Jang DS, Park EJ, Seo EK, Lee SK. Suppression of lipopolysaccharide-stimulated inducible nitric oxide synthase (iNOS) expression by a novel humulene derivative in macrophage cells. Int Immunopharmacol. 2009 Jul;9(7-8):844–9. doi: 10.1016/j.intimp.2009.03.005. PMID: 19298870.