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Total ion chromatogram of the analytes. The total ion chromatogram (TIC) of (a) 10 new psychoactive substances and (b) four internal standards in this study. Mephedrone: 4-methylmethcathinone; ephylone: N-ethylpentylone; 4-MEAPP: 4-methyl-α-ethylaminopentiophenone; PMA: para-methoxyamphetamine; PMMA: para-methoxymethamphetamine; DCK: deschloroketamine; 2-FDCK: 2-fluorodeschloroketamine; MDA-D5: 3,4-methylenedioxyamphetamine-D5.
