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Ozagrel methyl ester

Ozagrel methyl ester is a drug impurity.
Ozagrel methyl ester
Ozagrel methyl ester Chemical Structure CAS No.: 866157-50-8
Product category: Drug Intermediate
This product is for research use only, not for human use. We do not sell to patients.
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Product Description
Ozagrel methyl ester is a pharmaceutical impurity.
Ozagrel methyl ester (CAS 866157-50-8) is a methyl ester derivative of the antithrombotic drug ozagrel. It is a pharmaceutical impurity (Ozagrel Impurity G) with molecular formula C14H14N2O2 and molecular weight 242.27. The methyl ester is formed by esterification of the carboxylic acid group of ozagrel. This compound is used as a reference standard for impurity profiling and quality control in ozagrel drug substance manufacturing. It has also been investigated as a prodrug to increase lipophilicity and potentially improve oral absorption of the active ozagrel. For research use only; not for human therapy.
Biological Activity I Assay Protocols (From Reference)
Targets
Ozagrel methyl ester does not have a defined biological target as it is a prodrug/impurity. The parent drug ozagrel is a selective inhibitor of thromboxane A2 synthase (TXA2 synthase, EC 5.3.99.5), an enzyme responsible for the production of thromboxane A2, a potent vasoconstrictor and platelet aggregator. Ozagrel is used clinically to treat ischemic stroke and asthma. Upon hydrolysis by non-specific esterases, ozagrel methyl ester releases the active ozagrel. The methyl ester prodrug approach is intended to increase the molecule's lipophilicity for better GI absorption.
ln Vitro
Ozagrel methyl ester itself does not have significant in vitro activity until hydrolyzed to its active form, ozagrel. In vitro, ozagrel inhibits TXA2 synthase with an IC50 of approximately 0.5-2 microM. The methyl ester can be used to study esterase-mediated drug activation. It is also used as an analytical standard to identify and quantify impurities in ozagrel drug substance. No specific cell-based activity data for the methyl ester are reported.
ln Vivo
No in vivo activity data are available for ozagrel methyl ester as a standalone impurity. However, the parent drug ozagrel is clinically used as an antithrombotic agent. Ozagrel methyl ester, if administered, would be expected to be rapidly hydrolyzed to ozagrel by esterases in the GI tract and plasma, then exhibit antithrombotic activity. It is not used for efficacy studies. For research use only.
Enzyme Assay
Not applicable. Ozagrel methyl ester is a pharmaceutical impurity and analytical standard. For non-cellular characterization, a standard HPLC method is used: dissolve the compound in methanol or acetonitrile to 1 mg/mL. Inject onto a C18 column (250×4.6 mm, 5 microm). Mobile phase: 0.1% formic acid in water (A) and acetonitrile (B). Isocratic: 50% B. Flow rate: 1.0 mL/min, UV detection at 254 nm. Retention time is approximately 8-10 min. For LC-MS/MS, positive ESI mode, m/z 243 [M+H]+. Melting point: 113-117degC. Purity >98% (GC). No enzyme assays.
Cell Assay
Not applicable. Ozagrel methyl ester is not used in cell-based biological assays. It is a chemical reference standard for analytical quality control. For cell culture studies, the active ozagrel would be used. For research use only.
Animal Protocol
Not applicable. Ozagrel methyl ester is not used for in vivo animal studies. It is a reference standard for chemical analysis. No animal dosing or efficacy studies are performed with this compound. For research use only.
ADME/Pharmacokinetics
Not applicable. Ozagrel methyl ester is a pharmaceutical impurity, not a drug candidate. Its pharmacokinetic properties are not characterized. The parent drug ozagrel has a half-life (t½) of approximately 0.5-1.5 h in humans, low oral bioavailability due to first-pass metabolism, and is extensively metabolized. The methyl ester, if used as a prodrug, is designed to be rapidly hydrolyzed. For storage, powder at -20degC for up to 3 years, protected from light and moisture. Solubility: DMSO, methanol, ethanol. Appearance: solid.
Toxicity/Toxicokinetics
No toxicity data are available for ozagrel methyl ester as a pure compound. In pharmaceutical manufacturing, the allowable limit of this impurity is controlled (typically ≤0.1-0.5%). Standard laboratory safety precautions for handling chemical reference standards should be followed: avoid inhalation, ingestion, skin/eye contact; use PPE (gloves, lab coat, safety goggles); work in a fume hood. For research use only-not for human use.
Additional Infomation
CAS: 866157-50-8. Molecular formula: C14H14N2O2, molecular weight: 242.27. IUPAC name: methyl (E)-3-(4-((1H-imidazol-1-yl)methyl)phenyl)acrylate. Also known as Ozagrel Impurity G, ozagrel methylester. Purity: typically >98% (GC). Melting point: 113-117degC. Appearance: solid. Storage: -20degC. Use: pharmaceutical reference standard, impurity profiling. Not for human use. For research only.
These protocols are for reference only. InvivoChem does not independently validate these methods.
Physicochemical Properties
Molecular Formula
C14H14N2O2
Molecular Weight
242.27
CAS #
866157-50-8
Related CAS #
Ozagrel methyl ester
Appearance
Solid powder
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)
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 : PEG300Tween 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).
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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 : PEG300Tween 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).
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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 4.1276 mL 20.6381 mL 41.2763 mL
5 mM 0.8255 mL 4.1276 mL 8.2553 mL
10 mM 0.4128 mL 2.0638 mL 4.1276 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.

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An example of molarity calculation using the molarity calculator is shown below:
What is the mass of compound required to make a 10 mM stock solution in 5 ml of DMSO given that the molecular weight of the compound is 350.26 g/mol?
  • Enter 350.26 in the Molecular Weight (MW) box
  • Enter 10 in the Concentration box and choose the correct unit (mM)
  • Enter 5 in the Volume box and choose the correct unit (mL)
  • Click the “Calculate” button
  • The answer of 17.513 mg appears in the Mass box. In a similar way, you may calculate the volume and concentration.

Dilution Calculator allows you to calculate how to dilute a stock solution of known concentrations. For example, you may Enter C1, C2 & V2 to calculate V1, as detailed below:

What volume of a given 10 mM stock solution is required to make 25 ml of a 25 μM solution?
Using the equation C1V1 = C2V2, where C1=10 mM, C2=25 μM, V2=25 ml and V1 is the unknown:
  • Enter 10 into the Concentration (Start) box and choose the correct unit (mM)
  • Enter 25 into the Concentration (End) box and select the correct unit (mM)
  • Enter 25 into the Volume (End) box and choose the correct unit (mL)
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  • The answer of 62.5 μL (0.1 ml) appears in the Volume (Start) box
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Note: Chemical formula is case sensitive: C12H18N3O4  c12h18n3o4
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Definitions of molecular mass, molecular weight, molar mass and molar weight:
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In vivo Formulation Calculator (Clear solution)
Step 1: Enter information below (Recommended: An additional animal to make allowance for loss during the experiment)
Step 2: Enter in vivo formulation (This is only a calculator, not the exact formulation for a specific product. Please contact us first if there is no in vivo formulation in the solubility section.)
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Calculation results

Working concentration mg/mL;

Method for preparing DMSO stock solution mg drug pre-dissolved in μL DMSO (stock solution concentration mg/mL). Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug.

Method for preparing in vivo formulation:Take μL DMSO stock solution, next add μL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH2O,mix and clarify.

(1) Please be sure that the solution is clear before the addition of next solvent. Dissolution methods like vortex, ultrasound or warming and heat may be used to aid dissolving.
             (2) Be sure to add the solvent(s) in order.

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