4-(Benzyloxy)butyryl-L-carnitine Benzyl Ester Chloride is an intermediate in the synthesis of 4-Hydroxybutyryl-L-carnitine Chloride (H824655), anÂarylÂcarnitine, which is an important metabolite used as a diagnostic tool for detecting inherited metabolic disorders. Antibodies can be raised againstÂL-carnitine and other carnitine-related compounds to measure the quantity of L-carnitine in biological samples and serum.