Otenabant free base

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MedKoo CAT#: 525805

CAS#: 686344-29-6 (free base)

Description: Otenabant Hydrochloride is the salt of Otenabant, also known as CP-945,598, a drug which acts as a potent and highly selective CB1 antagonist. It was developed by Pfizer for the treatment of obesity, but development for this application has been discontinued following the problems seen during clinical use of the similar drug rimonabant.

Chemical Structure

Otenabant free base
CAS# 686344-29-6 (free base)

Theoretical Analysis

MedKoo Cat#: 525805
Name: Otenabant free base
CAS#: 686344-29-6 (free base)
Chemical Formula: C25H25Cl2N7O
Exact Mass: 509.1498
Molecular Weight: 510.423
Elemental Analysis: C, 58.83; H, 4.94; Cl, 13.89; N, 19.21; O, 3.13

Price and Availability

Size Price Availability Quantity
50.0mg USD 750.0 2 Weeks
100.0mg USD 1350.0 2 Weeks
200.0mg USD 2250.0 2 Weeks
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Related CAS #: 686347-12-6 (HCl)   686344-29-6 (free base)  

Synonym: CP945598; CP-945598; CP 945598; CP945,598; CP-945,598; CP 945,598; Otenabant

IUPAC/Chemical Name: 1-(8-(2-chlorophenyl)-9-(4-chlorophenyl)-9H-purin-6-yl)-4-(ethylamino)piperidine-4-carboxamide


InChi Code: InChI=1S/C25H25Cl2N7O/c1-2-31-25(24(28)35)11-13-33(14-12-25)22-20-23(30-15-29-22)34(17-9-7-16(26)8-10-17)21(32-20)18-5-3-4-6-19(18)27/h3-10,15,31H,2,11-14H2,1H3,(H2,28,35)


Appearance: Solid powder

Purity: >98% (or refer to the Certificate of Analysis)

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition: Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Solubility: Soluble in DMSO

Shelf Life: >2 years if stored properly

Drug Formulation: This drug may be formulated in DMSO

Stock Solution Storage: 0 - 4 C for short term (days to weeks), or -20 C for long term (months).

HS Tariff Code: 2934.99.9001

Preparing Stock Solutions

The following data is based on the product molecular weight 510.423 Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.

Recalculate based on batch purity %
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.15 mL 5.76 mL 11.51 mL
5 mM 0.23 mL 1.15 mL 2.3 mL
10 mM 0.12 mL 0.58 mL 1.15 mL
50 mM 0.02 mL 0.12 mL 0.23 mL

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1: Miao Z, Sun H, Liras J, Prakash C. Excretion, metabolism, and pharmacokinetics of 1-(8-(2-chlorophenyl)-9-(4-chlorophenyl)-9H-purin-6-yl)-4-(ethylamino)piperidine- 4-carboxamide, a selective cannabinoid receptor antagonist, in healthy male volunteers. Drug Metab Dispos. 2012 Mar;40(3):568-78. doi: 10.1124/dmd.111.043273. Epub 2011 Dec 20. PubMed PMID: 22187487.

2: Miao Z, Scott DO, Griffith DA, Day R, Prakash C. Excretion, metabolism, and pharmacokinetics of CP-945,598, a selective cannabinoid receptor antagonist, in rats, mice, and dogs. Drug Metab Dispos. 2011 Dec;39(12):2191-208. doi: 10.1124/dmd.111.040360. Epub 2011 Aug 29. PubMed PMID: 21875952.

3: Aronne LJ, Finer N, Hollander PA, England RD, Klioze SS, Chew RD, Fountaine RJ, Powell CM, Obourn JD. Efficacy and safety of CP-945,598, a selective cannabinoid CB1 receptor antagonist, on weight loss and maintenance. Obesity (Silver Spring). 2011 Jul;19(7):1404-14. doi: 10.1038/oby.2010.352. Epub 2011 Feb 3. PubMed PMID: 21293451.

4: Hadcock JR, Griffith DA, Iredale PA, Carpino PA, Dow RL, Black SC, O'Connor R, Gautreau D, Lizano JS, Ward K, Hargrove DM, Kelly-Sullivan D, Scott DO. In vitro and in vivo pharmacology of CP-945,598, a potent and selective cannabinoid CB(1) receptor antagonist for the management of obesity. Biochem Biophys Res Commun. 2010 Apr 2;394(2):366-71. doi: 10.1016/j.bbrc.2010.03.015. Epub 2010 Mar 6. PubMed PMID: 20211605.

5: Griffith DA, Hadcock JR, Black SC, Iredale PA, Carpino PA, DaSilva-Jardine P, Day R, DiBrino J, Dow RL, Landis MS, O'Connor RE, Scott DO. Discovery of 1-[9-(4-chlorophenyl)-8-(2-chlorophenyl)-9H-purin-6-yl]-4-ethylaminopiperidine-4- carboxylic acid amide hydrochloride (CP-945,598), a novel, potent, and selective cannabinoid type 1 receptor antagonist. J Med Chem. 2009 Jan 22;52(2):234-7. doi: 10.1021/jm8012932. PubMed PMID: 19102698.

6: Woods SC. The endocannabinoid system: novel pathway for cardiometabolic Risk-factor reduction. JAAPA. 2007 Nov;Suppl Endocannabinoid:7-10. Review. PubMed PMID: 18047036.

Additional Information

Related CAS#
Otenabant HCl = CAS#686347-12-6 (HCl).
Otenabant free base = CAS#686344-29-6 (free base).