Kushenol K, a flavonoid antioxidant found in Sophora flavescens. Kushenol K is an inhibitor (blocker/antagonist) of CYP3A4 with a Ki of 1.35 μM. Kushenol K has weak antiviral effect against HSV-2 (EC50 of 147 μM). Kushenol K also inhibits the activity of SGLT1 and SGLT2.

Physicochemical Properties

Molecular Formula	C26H32O8
Molecular Weight	472.53
Exact Mass	472.209
CAS #	101236-49-1
PubChem CID	44428630
Appearance	Typically exists as solid at room temperature
Density	1.3±0.1 g/cm3
Boiling Point	722.4±60.0 °C at 760 mmHg
Flash Point	242.4±26.4 °C
Vapour Pressure	0.0±2.5 mmHg at 25°C
Index of Refraction	1.614
LogP	3.81
Hydrogen Bond Donor Count	5
Hydrogen Bond Acceptor Count	8
Rotatable Bond Count	8
Heavy Atom Count	34
Complexity	724
Defined Atom Stereocenter Count	3
SMILES	C=C(C)[C@H](CCC(C)(C)O)CC1=C2C(=C(C=C1O)OC)C(=O)[C@H]([C@@H](C3=C(C=C(C=C3)O)O)O2)O
InChi Key	YWHHRFNOJTVNBI-LBEFLKDASA-N
InChi Code	InChI=1S/C26H32O8/c1-13(2)14(8-9-26(3,4)32)10-17-19(29)12-20(33-5)21-22(30)23(31)25(34-24(17)21)16-7-6-15(27)11-18(16)28/h6-7,11-12,14,23,25,27-29,31-32H,1,8-10H2,2-5H3/t14-,23-,25-/m1/s1
Chemical Name	(2R,3S)-2-(2,4-dihydroxyphenyl)-3,7-dihydroxy-8-[(2R)-5-hydroxy-5-methyl-2-prop-1-en-2-ylhexyl]-5-methoxy-2,3-dihydrochromen-4-one
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	CYP3A4 1.35 μM (Ki) CYP3 SGLT1 SGLT2 HSV-2 147 μM (EC50)
ln Vitro	Kushenol K shows substantial inhibition with an IC50 value of 1.62 µM when Midazolam is utilized as the substrate of CYP3A4[1]. At 50 micrograms per milliliter, Kushenol K inhibits SGLT1 at a rate of 29.7% and SGLT2 at a rate of 43.7%[3].
References	[1]. Drug interaction study of flavonoids toward CYP3A4 and their quantitative structure activity relationship (QSAR) analysis for predicting potential effects. Toxicol Lett. 2018 Sep 15;294:27-36. [2]. A new prenylated flavonol from the roots of Sophora flavescens. J Nat Prod. 1998 Dec;61(12):1552-4. [3]. Na+-glucose cotransporter (SGLT) inhibitory flavonoids from the roots of Sophora flavescens. Bioorg Med Chem. 2007 May 15;15(10):3445-9.
Additional Infomation	Kushenol K has been reported in Sophora flavescens with data available.

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	2.1163 mL	10.5813 mL	21.1627 mL
	5 mM	0.4233 mL	2.1163 mL	4.2325 mL
	10 mM	0.2116 mL	1.0581 mL	2.1163 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.