(R)-Oxybutynin (Aroxybutynin), the racemic isomer of Oxybutynin, is an orally bioactive muscarinic receptor blocker (antagonist). (R)-Oxybutynin has antispasmodic and anticholinergic activities and competitively antagonizes carbachol-induced contractions. (R)-Oxybutynin may be utilized to study urinary incontinence caused by neurogenic bladder dysfunction. (R)-Oxybutynin is a reagent for click chemistry. It has Alkyne groups and could undergo CuAAc (copper-catalyzed azide-alkyne cycloaddition reaction) with compounds bearing Azide groups.

Physicochemical Properties

Molecular Formula	C22H31NO3
Molecular Weight	393.94700
Exact Mass	393.207
Elemental Analysis	C, 73.92; H, 8.74; N, 3.92; O, 13.43
CAS #	119618-21-2
Related CAS #	Oxybutynin;5633-20-5;Oxybutynin chloride;1508-65-2;(R)-Oxybutynin hydrochloride;1207344-05-5;Oxybutynin-d11 chloride;1185151-95-4; Oxybutynin;5633-20-5;(R)-Oxybutynin hydrochloride;1207344-05-5;Oxybutynin-d11 chloride;1185151-95-4;(R)-Oxybutynin;119618-21-2; 5633-20-5 (racemate); 1508-65-2 (racemate HCl); 1207344-05-5 (R-isomer HCl); 119618-21-2 (R-isomer); 2738613-22-2 (R-isomer citrate); 119618-22-3 (S-isomer); 2862851-81-6 (R-isomer tartrate); 230949-16-3 (S-isomer HCl)
PubChem CID	6098167
Appearance	Typically exists as solid at room temperature
Melting Point	52-54ºC
LogP	4.144
Hydrogen Bond Donor Count	1
Hydrogen Bond Acceptor Count	4
Rotatable Bond Count	8
Heavy Atom Count	26
Complexity	490
Defined Atom Stereocenter Count	1
SMILES	CC#C[C@@H](Cl)O
InChi Key	XIQVNETUBQGFHX-QFIPXVFZSA-N
InChi Code	InChI=1S/C22H31NO3/c1-3-23(4-2)17-11-12-18-26-21(24)22(25,19-13-7-5-8-14-19)20-15-9-6-10-16-20/h5,7-8,13-14,20,25H,3-4,6,9-10,15-18H2,1-2H3/t22-/m0/s1
Chemical Name	4-(diethylamino)but-2-ynyl (2R)-2-cyclohexyl-2-hydroxy-2-phenylacetate
Synonyms	(r)-oxybutynin; 119618-21-2; Aroxybutynin; (-)-Oxybutynin; Oxybutynin, (-)-; r-oxybutynin; (R)-Oxybutynin Chloride; OXYBUTYNIN, (R)-;
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	mAChR
ln Vitro	In coronary artery smooth muscle cells, oxybutynin chloride (0.1, 0.3, 1, 3, 10, 30, 100 μM; 200 ms) inhibits vascular Kv channels in a concentration-dependent manner without causing an anticholinergic effect[1].
ln Vivo	For specific [3H]N-methylscopolamine binding, 0.5 and 2 hours later, oxybutynin chloride (27.2 mg/kg; po; single) shows a 2-fold increase in Kd values[2]. This indicates a significant binding of mouse brain muscarinic receptors.
References	[1]. Li H, et al. The anticholinergic drug oxybutynin inhibits voltage-dependent K+ channels in coronary arterial smooth muscle cells. Clin Exp Pharmacol Physiol. 2019 Nov;46(11):1030-1036. [2]. Oki T, et al. Comparative evaluation of central muscarinic receptor binding activity by oxybutynin, tolterodine and darifenacin used to treat overactive bladder. J Urol. 2007 Feb;177(2):766-70.
Additional Infomation	(R)-oxybutynin is a 4-(diethylamino)but-2-yn-1-ol that has R configuration. It is responsible for virtually all of the antimuscarinic activity of (racemic) oxybutynin. It has a role as a cholinergic antagonist, a calcium channel blocker and a local anaesthetic. It is an enantiomer of an esoxybutynin.

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	2.5384 mL	12.6920 mL	25.3839 mL
	5 mM	0.5077 mL	2.5384 mL	5.0768 mL
	10 mM	0.2538 mL	1.2692 mL	2.5384 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.