(p-sec-Butylphenyl)acetic Acid is a useful synthetic intermediate in the synthesis of 2-(p-sec-Butylphenyl)propionic Acid (B692720); an impurity of Ibuprofen (I140000) which is a selective cyclooxygenase inhibitor (IC50=14.9uM) that inhibits PGH synthase-1 and PGH synthase-2 with comparable potency.