Roburic acid, a tetracyclic triterpenoid found in Gentiana macrophylla, acts as an inhibitor of COX, with IC50s of 5 and 9 μM for COX-1 and COX-2, respectively[1].
[1]. Cao H, et al. Discovery of cyclooxygenase inhibitors from medicinal plants used to treat inflammation. Pharmacol Res. 2010 Jun;61(6):519-24.
















