Kushenol E is a class of flavonoids isolated from Sophora flavescens and is a non-competitive indoleamine 2,3-dioxygenase 1 (IDO1) inhibitor with an IC50 of 7.7 µM and a Ki of 9.5 µM, has anti-tumor activity[1].
[1]. Kwon M, et al. Inhibitory effects of flavonoids isolated from Sophora flavescens on indoleamine 2,3-dioxygenase 1 activity. J Enzyme Inhib Med Chem. 2019 Dec;34(1):1481-1488.
















