CAS No. 1668565-74-9

Batch: Purity:99.76
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IDO inhibitor 1 Chemical Structure
Chemical Structure
Check the IDO inhibitor 1 product page for in-depth specifications, including solubility, stock solutions, MOA, and working concentrations.

Chemical Information

IUPAC Name 1-[2-[bis(2-methylpropyl)amino]-5-[2-(2H-tetrazol-5-yl)phenyl]phenyl]-3-(4-methylphenyl)urea
CAS Number 1668565-74-9
Molecular Formula

C29H35N7O
Molecular Weight (MW) 497.63
SMILES CC1=CC=C(C=C1)NC(=O)NC2=C(C=CC(=C2)C3=CC=CC=C3C4=NNN=N4)N(CC(C)C)CC(C)C
InChIKey CJNMMPAEIYFQIJ-UHFFFAOYSA-N

Ordering Information

Biological Activity

IDO inhibitor 1 is a potent inhibitor of indoleamine 2,3-dioxygenase (IDO). By suppressing IDO-mediated tryptophan catabolism along the kynurenine pathway, it prevents tryptophan depletion and reduces the accumulation of immunosuppressive metabolites. Consequently, this target blockade enhances effector T-cell proliferation and activation, overcoming tumor-induced immunosuppression to promote robust anti-tumor immune responses in preclinical cancer models. [1]

How to Prepare Stock Solution?

Concentration Volume Mass
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Solubility

Batch:
All in vitro solubility values are batch-tested experimental data (non-literature values).
Solvent Solubility & Note
DMSO 99 mg/mL (198.94 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO. The recommended stock concentration is 10 mM in DMSO.)
Ethanol 99 mg/mL
Water Insoluble
FAQ
Q: Why does a DMSO stock precipitate in media/saline?
A: It is caused by unheated aqueous media (supersaturation), local solvent shock, or incorrect mixing sequence.
How to fix it?
  • Preheat media/saline to 37°C.
  • Mix rapidly (pipette/vortex) upon addition.
  • For complex mixes, always add the aqueous phase last.
  • Re-dissolve minor precipitates with a 37°C water bath and sonication (≤30 min).

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Note: Technical data last updated: Sep 1, 2026.