GW 7647 is a potent, selective agonist of human and murine PPARα. It activates human PPARα, PPARγ, and PPAR.delta. with EC50 values of 0.006, 1.1 and 6.2 µM, respectively, in a GAL4-PPAR binding assay. Similar EC50 values of 0.001, 1.3, and 2.9 were observed with the murine receptors. GW 7647 lowered triglycerides 93% and 60% in fat-fed hamsters and rats, respectively, at a dose of 3 mg/kg.