Figure 3From: Cannabinoid receptor type 2 (CB2)-selective N-aryl-oxadiazolyl-propionamides: synthesis, radiolabelling, molecular modelling and biological evaluation Influence of substitution at ring C ( cf. Figure 1 ) on affinity towards hCB2. The pK i values were calculated according to pK i = −log (K i). High pK i values represent high affinity.Back to article page