Medchemexpress, HY-15443 5mg AM251 CAS:183232-66-8 AM251 is a selective cannabinoid 1 (CB1) receptor antagonist with an IC50 of 8 nM, also acts as a potent GPR55 agonist with an EC50 of 39 nM. Purity:>98% Medchemexpress has over 10000 novel life-science reagents, reference compounds, APIs and natural compounds for laboratory and scientific use. Other quantity can also be offered.