F 1563 (OTTO) 2-Fluorobenzoyl chloride, 99% Cas 393-52-2 - used in the preparation of 3-(N-Hydroxycarbamimidoyl)-benzoic acid methyl ester. It has been used to develop an hollow-fiber liquid phase microextraction with in situ derivatization method coupled with HPLC-UV for the determination of metformin hydrochloride in biological fluids.