Olmesartan Medoxomil (formerly CS-866; Olmetec; Azor; Benicar; Olsertain), the medoxomil ester prodrug form of Olmesartan, is a potent and selective angiotensin II type 1/AT1 receptor antagonist with anti-hypertensive effects. It has been approved for use in the treatment of high blood pressure. It also inhibits the negative regulatory feedback on renin secretion. The result of receptor inhibition is vasodilation and a reduction in peripheral resistance. Olmesartan Medoxomil significantly reduces liver hydroxyproline content, and TGF-beta1.

Physicochemical Properties

Molecular Formula	C29H30N6O6
Molecular Weight	558.59
Exact Mass	558.222
CAS #	144689-63-4
Related CAS #	Olmesartan medoxomil;144689-63-4
PubChem CID	130881
Appearance	White to yellow solid powder
Density	1.4±0.1 g/cm3
Boiling Point	804.2±75.0 °C at 760 mmHg
Melting Point	180°C
Flash Point	440.2±37.1 °C
Vapour Pressure	0.0±3.0 mmHg at 25°C
Index of Refraction	1.661
LogP	5.23
Hydrogen Bond Donor Count	2
Hydrogen Bond Acceptor Count	10
Rotatable Bond Count	11
Heavy Atom Count	41
Complexity	969
Defined Atom Stereocenter Count	0
InChi Key	UQGKUQLKSCSZGY-UHFFFAOYSA-N
InChi Code	InChI=1S/C29H30N6O6/c1-5-8-23-30-25(29(3,4)38)24(27(36)39-16-22-17(2)40-28(37)41-22)35(23)15-18-11-13-19(14-12-18)20-9-6-7-10-21(20)26-31-33-34-32-26/h6-7,9-14,38H,5,8,15-16H2,1-4H3,(H,31,32,33,34)
Chemical Name	1H-Imidazole-5-carboxylic acid, 4-(1-hydroxy-1-methylethyl)-2-propyl-1-((2-(1H-tetrazol-5-yl)(1,1-biphenyl)-4-yl)methyl)-, (5-methyl-2-oxo-1,3-dioxol-4-yl)methyl ester
Synonyms	Olsertain;CS866; Olmesartan medoxomil; CS 866; CS-866; Olmetec; Azor; Benicar;
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

ln Vitro	In vitro activity: Olmesartan Medoxomil significantly reduces liver hydroxyproline content, the mRNA expression of collagen alpha1(I) and alpha-smooth muscle actin (alpha-SMA), and plasma levels of transforming growth factor-beta1 (TGF-beta1). Olmesartan Medoxomil is a pro-drug containing an ester moiety that, after oral administration, is rapidly cleaved to release the active form Olmesartan (RNH-6270). Olmesartan is a highly potent, competitive and selective All AT1 receptor antagonist with almost no antagonistic activity on AT2 and AT4 receptors. Kinase Assay: Olmesartan medoxomil is a potent and selective angiotensin AT1 receptor inhibitor with IC50 of 66.2 μM.
ln Vivo	Olmesartan produces a rapid and long-lasting inhibition of All-induced pressor responses in conscious rats. Oralolmesartan medoxomil also inhibits All-pressor response but onset of the action is slower compared with intravenous administration. Olmesartan Medoxomil exhibits dose-dependent antihypertensive effects in several rat and dog models, with the most marked effects seen in high plasma renin models, when compared with normal or low renin types. Olmesartan medoxomil exhibits, beside antihypertensive effects, beneficial effects in animal models of various types of nephrosis and heart failure, and anti-atherogenic effects in hyperlipidaemic animals. Olmesartan Medoxomil dose-dependently ameliorates the colonic histopathological and biochemical injuries in rats, an effect that is comparable or even better than that of the standard Sulfasalazine. Olmesartan medoxomil significantly reduces the induction of hypoxic cor pulmonale not only on echocardiographical observations but also in brain natriuretic peptide (BNP) in chronic hypoxic rats, TGF-beta and endothelin gene expressions in molecular studies.
Animal Protocol	10 to 12-week old male db/db diabetic mice with background strain C57BL/KsJ and their age-matched non-diabetic lean control mice (C57BL) are used.10 non-diabetic control mice and 10 diabetic mice are fed with placebo (0.5% sodium CMC/saline solution), and 10 diabetic mice are fed with 20 mg/kg Olmesartan (MB5704) by daily gavage for 12 weeks. Mice are monitored for blood glucose, body weight and urine output every two weeks. After treatment, mice are euthanized and trunk blood is collected and is centrifuged to obtain plasma which is aliquoted and stored at -80°C. Kidney tissues are removed from mice. For protein extraction slices of the kidney tissue are frozen in liquid nitrogen, and stored at -80°C. Other parts of the kidney tissue are fixed with 4% paraformaldehyde and embedded in paraffin for immunostaining. Mice
References	Br J Pharmacol.2003 Jul;139(6):1085-94;J Hypertens Suppl.2001 Jun;19(1):S3-14.
Additional Infomation	Olmesartan medoxomil is a member of biphenyls. Olmesartan Medoxomil is a synthetic imidazole derivative prodrug with an antihypertensive property. Upon hydrolysis, olmesartan medoxomil is converted to olmesartan. Olmesartan selectively binds to the angiotensin type 1 (AT1) receptor of angiotensin II in vascular smooth muscle and adrenal gland, thereby competing angiotensin II binding to the receptor. This prevents angiotensin II-induced vasoconstriction and decreases aldosterone production, thereby preventing aldosterone-stimulated sodium retention and potassium excretion. An ANGIOTENSIN II TYPE 1 RECEPTOR BLOCKER that is used to manage HYPERTENSION. See also: Olmesartan (has active moiety); Hydrochlorothiazide; olmesartan medoxomil (component of); Amlodipine Besylate; Olmesartan Medoxomil (component of) ... View More ...

Solubility Data

Solubility (In Vitro)

DMSO:89 mg/mL (159.3 mM) Water:<1 mg/mL Ethanol:<1 mg/mL

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	1.7902 mL	8.9511 mL	17.9022 mL
	5 mM	0.3580 mL	1.7902 mL	3.5804 mL
	10 mM	0.1790 mL	0.8951 mL	1.7902 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.