Palbinone is a terpenoid isolated from the roots of Paeonia albiflora Pallas, potently inhibits 3α-hydroxysteroid dehydrogenase (3α-HSD), with an IC50 of 46 nM. Anti-inflammatory activity[1]. IC50: 46 nM (3α-HSD)[1]
[1]. Kadota S, et al. Palbinone, a novel terpenoid from Paeonia albiflora; potent inhibitory activity on 3 alpha-hydroxysteroid dehydrogenase. Chem Pharm Bull (Tokyo). 1993 Mar;41(3):487-90.