β-Cembrenediol (β-CBT) is a natural product from tobacco plants that is found in cigarette smoke condensate. β-CBT inhibits induction of the early antigen of Epstein-Barr virus (EA-EBV) by 12-O-tetradecanoylphorbol-13-acetate (TPA) in vitro (IC50 = 21.9 μM). It inhibits tumor promoting effects of TPA on 7,12-demethylbenz[a]anthracene-induced papilloma formation in vivo. β-CBT is also released into soil by flue-cured tobacco plants and exerts autotoxicity as well as phytotoxic activity against L. sativa seedlings.

IDO1-IN-28（Compound MQ-1）是一种选择性的 Apo-IDO1 抑制剂，IC50 为 1.29 μM，可破坏血红素与吲哚胺 2,3-双加氧酶 1（IDO1）apo 形式的结合。IDO1-IN-28 被广泛应用于肿瘤研究中，用于探究免疫逃逸机制、色氨酸代谢途径以及免疫肿瘤学靶向治疗策略。

IDO-IN-8 is an indoleamine 2,3-dioxygenase (IDO) inhibitor (IC50: 1-10 μM).

Imsamotide (IDO194-214) 为一种具有序列 DTLLKALLEIASCLEKALQVF 的吲哚胺 2,3-双加氧酶 (IDO) 肽。它同时作为主动免疫的免疫剂和抗肿瘤剂。

IDO1-IN-21（化合物10m）为IDO1抑制剂，其IC50值为0.64 μM。该化合物在小鼠体内可有效抑制肿瘤生长。

IDO1/TDO-IN-6（compound 11）为IDO1/TDO双重抑制剂，其IC50值分别为2.25 μM和2.89 μM。在抑制IDO1和TDO方面，其Ki值分别为1.9 μM和3.1 μM。IDO1/TDO-IN-6适用于癌症与免疫学领域的研究。

IDO-IN-5 is an indoleamine 2,3-dioxygenase (IDO) inhibitor (IC50: 1-10 μM).

(S)-IDO1-IN-5 is an active S-isomer of IDO1-IN-5. (S)-IDO1-IN-5 binds to IDOL(IC50 value less than 1.5 µΜ).

(Rac)-IDO1-IN-5 is a racemate of IDO1-IN-5, a potent, selective, and brain-penetrating inhibitor of Indoleamine 2,3-Dioxygenase 1 (IDO1) activity. It specifically binds to apo-IDO1, which lacks heme, instead of mature heme-bound IDO1.