“…Law enforcement in various countries has attempted to circumvent the use and distribution of the most common of these, namely 3, 4-methylenedioxypyrovalerone (MDPV), 3,4-methylenedioxymethcathinone (methylone) and 4-methylmethcathinone (mephedrone). For example, these compounds were given emergency Schedule I classification in the US in 2011 and now have permanent classification as such (Drug Enforcement Administration, 2011;Fass et al, 2012). These compounds, as well as several behaviorally active derivatives, however, are still being produced and distributed, thus their continued characterization is crucial (Araújo et al, 2014;Baumann, 2014; for a review, see German et al, 2014;Marusich et al, 2014).…”