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Mephedrone metabolites analyzed in the current study. On top is highlighted mephedrone structure with its stereocenter (asterisk) which leads to the two enantiomers (R- and S-mephedrone). The metabolites analyzed in the current study are highlighted by the grey rectangles in the background with the enantiomers of the same metabolite being grouped within the same rectangle. Note that in the case of the 4-COOH-MC only the racemate was tested.
