Ketoprofen intermediate.Method for Determining Identity: Proton NMR (CDCl3) and MSTLC Conditions:SiO2; Hexane : Ethyl Acetate (4:1). Visualized with UV and AMCS (Rf = 0.30).Storage and Stability:Store at 4°C. For maximum recovery of product, centrifuge the original vial prior to removing the cap.