PI3Kγ inhibitor 4 is a specific and orally bioactive PI3Kγ inhibitor (antagonist) with IC50 of 40 nM. The selectivity of PI3Kγ inhibitor 4 for PI3Kγ is ~7, 43 and 18 times that of α, β and δ isoforms respectively. PI3Kγ inhibitor 4 may be utilized in the study of airway inflammation.

Physicochemical Properties

Molecular Formula	C20H24N4O4S
Molecular Weight	416.493963241577
Exact Mass	416.151
CAS #	1821038-80-5
PubChem CID	118470069
Appearance	Typically exists as solid at room temperature
LogP	1.9
Hydrogen Bond Donor Count	3
Hydrogen Bond Acceptor Count	8
Rotatable Bond Count	6
Heavy Atom Count	29
Complexity	653
Defined Atom Stereocenter Count	0
InChi Key	UQIUWUJYJBQZBY-UHFFFAOYSA-N
InChi Code	InChI=1S/C20H24N4O4S/c1-12-5-6-15(29(26,27)24-11-20(3,4)25)8-16(12)14-7-17(19(21)23-9-14)18-10-22-13(2)28-18/h5-10,24-25H,11H2,1-4H3,(H2,21,23)
Chemical Name	3-[6-amino-5-(2-methyl-1,3-oxazol-5-yl)pyridin-3-yl]-N-(2-hydroxy-2-methylpropyl)-4-methylbenzenesulfonamide
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	PI3Kγ 40 nM (IC50) PI3Kα 300 nM (IC50)
ln Vitro	PI3Kγ inhibitor 4 has IC50 values of 120 nM and 6250 nM, respectively, which inhibit PI3Kγ and PI3Kγ in U937 cells[1].
ln Vivo	In a model of airway inflammation, the amplitude of the enhanced pause (ΔPenh) response to ovalbumin is dose-dependently inhibited by PI3Kγ inhibitor 4 (10–20 mg/kg; a single po)[1]. In rats, oral treatment of PI3Kγ inhibitor 4 (10, 100, and 300 mg/kg) results in high oral bioavailability (72, 94, and 122%) and Cmax (1.53, 12.2, and 25.2 μM)[1].
References	[1]. Discovery and Toxicological Profiling of Aminopyridines as Orally Bioavailable Selective Inhibitors of PI3-Kinase γ. J Med Chem. 2021 Aug 26;64(16):12304-12321.

Solubility Data

Solubility (In Vitro)

May dissolve in DMSO (in most cases), if not, try other solvents such as H2O, Ethanol, or DMF with a minute amount of products to avoid loss of samples

Solubility (In Vivo)

Note: Listed below are some common formulations that may be used to formulate products with low water solubility (e.g. < 1 mg/mL), you may test these formulations using a minute amount of products to avoid loss of samples. Injection Formulations (e.g. IP/IV/IM/SC) Injection Formulation 1: DMSO : Tween 80： Saline = 10 : 5 : 85 (i.e. 100 μL DMSO stock solution → 50 μL Tween 80 → 850 μL Saline) *Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH ₂ O to obtain a clear solution. Injection Formulation 2: DMSO : PEG300 ：Tween 80 : Saline = 10 : 40 : 5 : 45 (i.e. 100 μL DMSO → 400 μLPEG300 → 50 μL Tween 80 → 450 μL Saline) Injection Formulation 3: DMSO : Corn oil = 10 : 90 (i.e. 100 μL DMSO → 900 μL Corn oil) Example: Take the Injection Formulation 3 (DMSO : Corn oil = 10 : 90) as an example, if 1 mL of 2.5 mg/mL working solution is to be prepared, you can take 100 μL 25 mg/mL DMSO stock solution and add to 900 μL corn oil, mix well to obtain a clear or suspension solution (2.5 mg/mL, ready for use in animals). Injection Formulation 4: DMSO : 20% SBE-β-CD in saline = 10 : 90 [i.e. 100 μL DMSO → 900 μL (20% SBE-β-CD in saline)] *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. Injection Formulation 5: 2-Hydroxypropyl-β-cyclodextrin : Saline = 50 : 50 (i.e. 500 μL 2-Hydroxypropyl-β-cyclodextrin → 500 μL Saline) Injection Formulation 6: DMSO : PEG300 : castor oil : Saline = 5 : 10 : 20 : 65 (i.e. 50 μL DMSO → 100 μLPEG300 → 200 μL castor oil → 650 μL Saline) Injection Formulation 7: Ethanol : Cremophor : Saline = 10： 10 : 80 (i.e. 100 μL Ethanol → 100 μL Cremophor → 800 μL Saline) Injection Formulation 8: Dissolve in Cremophor/Ethanol (50 : 50), then diluted by Saline Injection Formulation 9: EtOH : Corn oil = 10 : 90 (i.e. 100 μL EtOH → 900 μL Corn oil) Injection Formulation 10: EtOH : PEG300：Tween 80 : Saline = 10 : 40 : 5 : 45 (i.e. 100 μL EtOH → 400 μLPEG300 → 50 μL Tween 80 → 450 μL Saline) Oral Formulations Oral Formulation 1: Suspend in 0.5% CMC Na (carboxymethylcellulose sodium) Oral Formulation 2: Suspend in 0.5% Carboxymethyl cellulose Example: Take the Oral Formulation 1 (Suspend in 0.5% CMC Na) as an example, if 100 mL of 2.5 mg/mL working solution is to be prepared, you can first prepare 0.5% CMC Na solution by measuring 0.5 g CMC Na and dissolve it in 100 mL ddH2O to obtain a clear solution; then add 250 mg of the product to 100 mL 0.5% CMC Na solution, to make the suspension solution (2.5 mg/mL, ready for use in animals). Oral Formulation 3: Dissolved in PEG400 Oral Formulation 4: Suspend in 0.2% Carboxymethyl cellulose Oral Formulation 5: Dissolve in 0.25% Tween 80 and 0.5% Carboxymethyl cellulose Oral Formulation 6: Mixing with food powders Note: Please be aware that the above formulations are for reference only. InvivoChem strongly recommends customers to read literature methods/protocols carefully before determining which formulation you should use for in vivo studies, as different compounds have different solubility properties and have to be formulated differently.  (Please use freshly prepared in vivo formulations for optimal results.)

Preparing Stock Solutions		1 mg	5 mg	10 mg
	1 mM	2.4010 mL	12.0051 mL	24.0102 mL
	5 mM	0.4802 mL	2.4010 mL	4.8020 mL
	10 mM	0.2401 mL	1.2005 mL	2.4010 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.