USL311 is a novel, selective and potent CXCR4 receptor antagonist with anticancer activity by disrupting the binding of stromal-cell derived factor-1 (SDF-1 or CXCL12) to CXCR4, which prevents CXCR4 activation and decreases proliferation and migration of CXCR4-expressing tumor cells.

Physicochemical Properties

Molecular Formula	C24H34N6O
Molecular Weight	422.566364765167
Exact Mass	422.28
Elemental Analysis	C, 68.22; H, 8.11; N, 19.89; O, 3.79
CAS #	1373268-67-7
PubChem CID	56961879
Appearance	Light yellow to yellow solid powder
LogP	3
Hydrogen Bond Donor Count	1
Hydrogen Bond Acceptor Count	6
Rotatable Bond Count	5
Heavy Atom Count	31
Complexity	558
Defined Atom Stereocenter Count	0
InChi Key	XNUNVQKARNSSEO-UHFFFAOYSA-N
InChi Code	InChI=1S/C24H34N6O/c1-19(2)28-15-9-21(10-16-28)29-13-4-14-30(18-17-29)23-6-3-5-22(27-23)24(31)26-20-7-11-25-12-8-20/h3,5-8,11-12,19,21H,4,9-10,13-18H2,1-2H3,(H,25,26,31)
Chemical Name	6-[4-(1-propan-2-ylpiperidin-4-yl)-1,4-diazepan-1-yl]-N-pyridin-4-ylpyridine-2-carboxamide
Synonyms	USL 311; USL-311; USL311
HS Tariff Code	2934.99.9001
Storage	Powder-20°C 3 years 4°C 2 years In solvent -80°C 6 months -20°C 1 month
Shipping Condition	Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)

Biological Activity

Targets	CXCR4
References	[1]. Usl-311 for use in the treatment of cancer. WO2018162924A1 [2]. Modulation of the chemokine/chemokine receptor axis as a novel approach for glioma therapy. Pharmacol Ther. 2021 Jun;222:107790.
Additional Infomation	USL-311 is under investigation in clinical trial NCT02765165 (Phase 1/2 Study of USL311 Alone and in Combination With Lomustine in Subjects With Advanced Solid Tumors and Relapsed/Recurrent Glioblastoma Multiforme (GBM)). CXCR4 Antagonist USL311 is an orally bioavailable inhibitor of C-X-C chemokine receptor type 4 (CXCR4), with potential antineoplastic activity. Upon administration, USL311 binds to CXCR4, thereby preventing the binding of stromal-cell derived factor-1 (SDF-1 or CXCL12) to CXCR4 and inhibiting CXCR4 activation, which may result in decreased proliferation and migration of CXCR4-expressing tumor cells. CXCR4, a chemokine receptor belonging to the G protein-coupled receptor (GPCR) family, plays an important role in chemotaxis and angiogenesis, and is upregulated in several tumor cell types.

Solubility Data

Solubility (In Vitro)

DMSO: ~18.6 mg/mL (~44.0 mM)

Solubility (In Vivo)

Solubility in Formulation 1: ≥ 2.08 mg/mL (4.92 mM) (saturation unknown) in 10% DMSO + 40% PEG300 + 5% Tween80 + 45% Saline (add these co-solvents sequentially from left to right, and one by one), clear solution. For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 20.8 mg/mL clear DMSO stock solution to 400 μL PEG300 and mix evenly; then add 50 μL Tween-80 to the above solution and mix evenly; then add 450 μL normal saline to adjust the volume to 1 mL. Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH₂ O to obtain a clear solution. Solubility in Formulation 2: ≥ 2.08 mg/mL (4.92 mM) (saturation unknown) in 10% DMSO + 90% (20% SBE-β-CD in Saline) (add these co-solvents sequentially from left to right, and one by one), clear solution. For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 20.8 mg/mL clear DMSO stock solution to 900 μL of 20% SBE-β-CD physiological saline solution and mix evenly. Preparation of 20% SBE-β-CD in Saline (4°C，1 week): Dissolve 2 g SBE-β-CD in 10 mL saline to obtain a clear solution. Solubility in Formulation 3: ≥ 2.08 mg/mL (4.92 mM) (saturation unknown) in 10% DMSO + 90% Corn Oil (add these co-solvents sequentially from left to right, and one by one), clear solution. For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 20.8 mg/mL clear DMSO stock solution to 900 μL of corn oil and mix evenly.  (Please use freshly prepared in vivo formulations for optimal results.)

Preparing Stock Solutions		1 mg	5 mg	10 mg
	1 mM	2.3665 mL	11.8324 mL	23.6647 mL
	5 mM	0.4733 mL	2.3665 mL	4.7329 mL
	10 mM	0.2366 mL	1.1832 mL	2.3665 mL

*Note: Please select an appropriate solvent for the preparation of stock solution based on your experiment needs. For most products, DMSO can be used for preparing stock solutions (e.g. 5 mM, 10 mM, or 20 mM concentration); some products with high aqueous solubility may be dissolved in water directly. Solubility information is available at the above Solubility Data section. Once the stock solution is prepared, aliquot it to routine usage volumes and store at -20°C or -80°C. Avoid repeated freeze and thaw cycles.