Glabrene, an isoflavene derived from licorice root, shows estrogen-like activity. Glabrene is a tyrosinase inhibitor with an IC50 of 3.5 μM[1][2]. IC50: 3.5 μM (Tyrosinase)[2]
[1]. Somjen D, et al. Estrogenic activity of glabridin and glabrene from licorice roots on human osteoblasts and prepubertal rat skeletal tissues. J Steroid Biochem Mol Biol. 2004 Aug;91(4-5):241-6. [2]. Nerya O, et al. Glabrene and isoliquiritigenin as tyrosinase inhibitors from licorice roots. J Agric Food Chem. 2003 Feb 26;51(5):1201-7