Fig. 7.
Liquid chromatograms for the enantiomeric excess of a S-(−)-MDPV, b R-(+)-MDPV, and c R-(+)-MDPV after reinjection; CSP1 column; mobile phase Hex/EtOH/TEA (97:3:0.1, v/v/v/), flow rate 0.5 mL, UV detection 254 nm
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