“…2-[(Z)-1-(3,5-diphenyl-1,3,4-thiadiazol-2(3H)-ylidene)methyl]-3,5-diphenyl-1,3,4-thiadiazol-3-ium chloride (TDZ, pharmaceutical substance, 99.5 % [18], trifluoroacetic acid (TFA, purity grade 99.0 %, Merck, USA), HPLC-grade acetonitrile (Panreac, Germany), deionized water for HPLC was prepared by Arium mini (Sartorius, Germany), sample solvent -solution of acetonitrile and 0.03 % TFA (1:1, v/v), filter-nylon i.d. 0.45 μm (Sartorius, Germany).…”