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HPLC-UV (blue) and –ECD (red) traces of rac-3e (a) and rac-4g (c) on Chiralpak IA column with hexane/2-propanol 80:20 eluent monitored at 240 nm. HPLC-ECD spectra of the first- [(4R), black] and second-eluting [(4S), red] enantiomers of 3e (b) and 4g (d).
