pyrazole derivative 6b (CBS0550) had high affinity for the CB(2) receptor (IC(50)=2.9 nM, EC(50)=1.8 nM, E(max)=85%), high selectivity for CB(2) (CB(1) IC(50)/CB(2) IC(50)=1400), and good physicochemicalproperties (solubility in water: 5.9 mg/100mL at 25 degrees C). Oral administration of 6b to rats at a dose of 10mg/kg resulted in significant plasma concentrations, and orally administered compound 6b significantly