“…For quantitative determination of ET in medical preparations and biological fl uids the ВЕРХ method was suggested [2,3] -direct ultraviolet spectrophotometry [4], photoelectrocolorymetry in the form of oxydative-hydrolitic decomposition product in the sulphuric acid environment [5]. For the purpose of detecting the falsifi ed medicines (identity clarifi cation) the methods of TLC, UV, and IR-spectroscopy were suggested [6].…”