Ciprofibrateimpurity A is an impurity of Ciprofibrate. Ciprofibrate is a PPARα agonist[1]. [1]. Passilly, P., et al., Phosphorylation of peroxisome proliferator-activated receptor alpha in rat Fao cells and stimulation by ciprofibrate. Biochem Pharmacol, 1999. 58(6): p. 1001-8.