2-Oxo-2-(1-phenyl-1H-pyrazol-4-yl)acetic Acid is a derivative of N-Phenylpyrazole, a reactant in the synthesis of candesartan cilexetil(C175580), an ester prodrug; hydrolized in vivo to the active carboxylic acid. Used in treatment of congestive heart failure. Antihypertensive.