H-Trp(1-Me)-OH是一种吲哚胺-2,3-双加氧酶 (IDO) 抑制剂，常用于癌症研究，能够通过调节免疫系统中的 T 细胞活性，抑制肿瘤生长，适用于免疫肿瘤学研究。

IDO-IN-1 is an indoleamine-2,3-dioxygenase (IDO) inhibitor with IC50 of 59 nM, shows activity in Hela cell (IC50=12 nM).

Coptisine is a protoberberine isoquinoline alkaloid isolated and purified from the herbs of Chelidonium majus L., which can increases cell viability based on its reversal effect on the enhanced activity of Indoleamine 2,3-dioxygenase .

Epacadostat（INCB 024360）是一种高效且选择性的吲哚胺2,3-双加氧酶1（IDO1）抑制剂，其IC50为71.8 nM。

BMS-986205 is a specific and irreversible inhibitor of IDO1 with IC50 value of 1.7 nM.

IDO-IN-4 is a potent IDO1 inhibitor with IC50 of 8 nM in human IDO1/HEK293 cells.

Indoximod is an indoleamine 2,3-dioxygenase (IDO) pathway inhibitor with a Ki of 19 μM.

NLG919 is a potent IDO (indoleamine-(2,3)-dioxygenase) pathway inhibitor with Ki/EC50 of 7 nM/75 nM in cell-free assays.

PF-06840003 is a highly selective orally bioavailable IDO-1 inhibitor with IC50 of 0.41 μM.

8-Nitrotryptanthrin is a potent human indoleamine 2,3-dioxygenase 2 (hIDO2) inhibitor which significantly reduces IDO2 activity with Ki of 0.97 μM.

IDO-IN-7 is a potent human IDO inhibitor with IC50 of < 1 μM.

INCB024360 analogue is a potent, competitive IDO1 (indoleamine-(2,3)-dioxygenase) inhibitor with IC50 of 67 nM.

Coptisine Chloride is a naturally occuring cytotoxic alkaloid found in Chinese goldthread which shows cytotoxic effect on heptoma and leukemic cells and is reported to block cell cycle progression.