LY-3381916 (LY3381916) is a novel, potent, oral, selective and brain penetrant inhibitor of IDO1 with anticancer activity.

Indoximod (NLG-8189; 1-Methyl-D-tryptophan; Indoximod; NLG8189; D1MT) is a potent IDO (indoleamine-(2,3)-dioxygenase) pathway inhibitor with potential immunomodulating and antitumor activity.

Coptisine chloride is a novel and potent MAO-A inhibitor.

IDO-IN-13 (GS-4361), extracted from patent WO2019040102A1, example 43, is a novel and potent indoleamine 2,3-dioxygenase 1 (IDO1) inhibitor with EC50 of 17 nM.