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| ECHA InfoCard | 100.162.062 |
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| Formula | C22H21Cl2IN4O |
| Molar mass | 555.24 g·mol−1 |
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AM-251 is aninverse agonist at theCB1cannabinoid receptor. AM-251 is structurally very close torimonabant; both arebiarylpyrazolecannabinoid receptor antagonists. In AM-251, thep-chloro group attached to thephenyl substituent at C-5 of thepyrazole ring is replaced with ap-iodo group. The resulting compound exhibits slightly betterbinding affinity for theCB1 receptor (with a Ki value of 7.5 nM) than rimonabant, which has a Ki value of 11.5 nM, AM-251 is, however, about two-fold more selective for the CB1 receptor when compared to rimonabant.[1] Like rimonabant, it is additionally a μ-opioid receptor antagonist[2] that attenuates analgesic effects.[3]
AM251 has shown anin vitro antimelanoma activity againstpancreatic andcolon cancer cells.[4]
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