Methyl 3-((Trifluoromethylsulfonyl)oxy)phenylacetate is an intermediate in the synthesis of m-Isobutyl Ibuprofen (I780080). m-Isobutyl Ibuprofen (Ibuprofen EP Impurity A) is an Ibuprofen (I140000) impurity used in the study of potent noncompetitive interleukin-8 inhibitors.