WARNING: This product is for research use only, not for human or veterinary use.

MedKoo CAT#: 555793

CAS#: 2166616-75-5 (free base)

Description: LY-3381916, also known as IDO1-IN-5, is a potent, selective and brain penetrated DO1 inhibitor. LY3381916 specifically targets and binds to IDO1, a cytosolic enzyme responsible for the oxidation of the amino acid tryptophan into the immunosuppressive metabolite kynurenine. By inhibiting IDO1 and decreasing kynurenine in tumor cells, LY3381916 restores and promotes the proliferation and activation of various immune cells, including dendritic cells (DCs), natural killer (NK) cells, and T lymphocytes, and causes a reduction in tumor-associated regulatory T cells (Tregs).

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Pricing updated 2021-01-26. Prices are subject to change without notice.

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Chemical Structure


Theoretical Analysis

MedKoo Cat#: 555793
Name: LY-3381916
CAS#: 2166616-75-5 (free base)
Chemical Formula: C23H25FN2O3
Exact Mass: 396.1849
Molecular Weight: 396.4624
Elemental Analysis: C, 69.68; H, 6.36; F, 4.79; N, 7.07; O, 12.11

Related CAS #: LY3381916 HCl   2166616-75-5 (free base)    

Synonym: LY-3381916; LY 3381916; LY 3381916; IDO1-IN-5; IDO1-IN-5; IDO1 IN-5; IDO1-IN5; IDO1IN5; IDO1 IN5;

IUPAC/Chemical Name: (R)-4-fluoro-N-(1-(1-(tetrahydro-2H-pyran-4-carbonyl)indolin-5-yl)ethyl)benzamide


InChi Code: InChI=1S/C23H25FN2O3/c1-15(25-22(27)16-2-5-20(24)6-3-16)18-4-7-21-19(14-18)8-11-26(21)23(28)17-9-12-29-13-10-17/h2-7,14-15,17H,8-13H2,1H3,(H,25,27)/t15-/m1/s1

SMILES Code: FC1=CC=C(C(N[C@H](C)C2=CC=C(N(C(C3CCOCC3)=O)CC4)C4=C2)=O)C=C1

Technical Data

Solid powder

>98% (or refer to the Certificate of Analysis)

Shipping Condition:
Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition:
Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Soluble in DMSO

Shelf Life:
>3 years if stored properly

Drug Formulation:
This drug may be formulated in DMSO

Stock Solution Storage:
0 - 4 C for short term (days to weeks), or -20 C for long term (months).

HS Tariff Code:

Additional Information

Activation of the immune system, which is suppressed in many cancers, may induce a cytotoxic T-lymphocyte (CTL) response against the IDO1-expressing tumor cells, thereby inhibiting the growth of IDO1-expressing tumor cells. IDO1, overexpressed by multiple tumor cell types, plays an important role in immunosuppression. Tryptophan depletion inhibits T-lymphocyte proliferation and activation, and subsequently suppresses the immune system.