Analytical techniques, such as H-NMR, 13 C-NMR, MS, HPLC, LCMS, and IR, were employed to characterise the metabolites from the reaction. In the case of 2CPTZ, two major metabolites have been successfully isolated in their pure form, including 2CPTZ-SO (sulfoxide metabolite) and 2CPTZ-SO2 (sulfone metabolite), for the first time (Scheme 3). Scheme 3. Electrosynthesis of 2CPTZ metabolites, 2CPTZ-SO and 2-CPTZ-SO2.