A mix of GC–MS, MS/MS and GC–IR strategies were being used to characterize the ring substitution sample, the alkyl aspect-chain and also the cyclic tertiary amine parts of the number of six homologous and regioisomeric methylenedioxyphenyl-aminoketones connected with the designer drug, 3,four-methylenedioxypyrovalerone (MDPV). Chromat