AM251

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AM251
The structure of AM251
Chemical formula  C22H21N4ICl2O 
Molar mass 555.238 g mol−1
Systematic name 1-(2,4-dichlorophenyl)-5-(4-iodophenyl]])-4-methyl-N-(1-piperidyl)pyrazole-3-carboxamide
Complete data

AM251 is a CB1 cannabinoid receptor antagonist. AM251 is structurally very close to SR 141716A (rimonabant), which both are biarylpyrazole cannabinoid receptor antagonists. In AM251 the p-chloro group attached to the phenyl substituent at C-5 of the pyrazole ring is replaced with a p-iodo group. The resulting compound exhibits slightly better binding affinity for the CB1 receptor with a Ki value of 7.5 nM compound to SR 141716A, which has a Ki value of 11.5 nM. However AM251 is about two-fold more selective for the CB1 receptor when compared to SR 141716A.[1]

[edit] References

  1. Lan, R., Liu, Q., Fan, P., et al. Structure-activity relationships of pyrazole derivatives as cannabinoid receptor antagonists. J Med Chem 42 769-776 (1999).