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Supercritical fluid chromatographic resolution on completely defined mono\u2010cyclodextrin derivative\u2010based chiral stationary phases (CSP) is a method of choice for the separation of aminoglutethimide but not effective for thalidomide. For both high performance liquid chromatography (HPLC) and supercritical fluid chromatography (SFC) conditions, the impact of the position, imposed to be 2 or 6 in our synthetic pathway, of the pentenyl moiety on one of the glucopyranosidics of the CD cage is of crucial importance in the chiral discrimination phenomenon. Additionally, the nature of the heteroatom present in the spacer arm between the CD and the silica gel, in this case thioether or sulfone functionality, is also essential for the chiral recognition mechanism(s) for the solute enantiomer. 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