BW 245C is a selective agonist for the DP1 receptor.{3128,711} The Ki of BW 245C for the inhibition of [3H]-PGD2 binding to isolated human platelet membranes is 0.9 nM.{3128} It has a reported IC50 of 2.5 nM for the inhibition of ADP-induced human platelet aggregation{419} and an IC50 of 250 nM for the inhibition of rat platelet aggregation.{711}