IDO1-IN-14 (compound 4a) is a highly effective inhibitor of the IDO1 enzyme, exhibiting an IC50 value of 396.9 nM. Additionally, IDO1-IN-14 demonstrates excellent suppression of cellular IDO1 activity, as observed in HeLa cells with an EC50 value of 3393 nM [1].
(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.
Benzomalvin C is a weak antagonist of the neurokinin-1 (NK1) receptor inhibiting binding of substance P by 46% when used at 100 μg/ml in vitro. It is also a weak inhibitor of indolamine 2,3-dioxygenase (IDO) with an IC50 value of 130 μM for recombinant IDO. It was isolated from Penicillium and contains an epoxide group at C-19 and C-20, which is not present in benzomalvins A, B, or E.