The invention relates to the use of aromatics sulfonamides of the general formula I as peroxynitrite rearrangement catalysts, to the preparation thereof and to the use thereof as medicament for the treatment of various disorders. Voltage clamping circuit is coupled between the rectifier circuit and the DC-to-DC converter, and functions to prevent the input voltage of the DC-to-DC converter from exceeding a predetermined acceptable level, so as to protect the DC-to-DC converter from damage due to transients in a voltage provided by an AC line source. The MOCVD system further enhances the excitation of the precursor vapors and utilizes an atmosphere of monatomic oxygen rather than the more conventional diatomic oxygen in order to optimize reaction kinetics and thereby increase the thin film growth rate. The invention also relates to a pharmaceutical composition and a peptide conjugate comprising the peptide of the invention.