IDO/TDO-IN-1 (compound 25) is a highly potent and orally active dual indoleamine-2,3-dioxygenase (IDO) and tryptophan 2,3-dioxygenase (TDO) inhibitor with IC50s of 9.7 and 47 nM, respectively [1]. IC50: 9.7 nM (Indoleamine-2,3-dioxygenase), 47 nM (Tryptophan 2,3-dioxygenase)[1]

IDO/TDO-IN-1 inhibits IDO in the Hela cell line with an IC50 of 76 nM[1].

[1]. Tu W, et al. Discovery of Imidazoisoindole Derivatives as Highly Potent and Orally Active Indoleamine-2,3-dioxygenase Inhibitors. ACS Med Chem Lett. 2019 Jun 3;10(6):949-953.