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Determination of the absolute configuration of 4-OH-RA enantiomers by exciton CD spectroscopy. CD spectra (top) of the 4-(dimethylamino)cinnamoyl esters of methyl (4S)- and (4R)-OH-retinoate in acetonitrile. The bottom panels show the structures of the 4-(dimethylamino)cinnamoyl esters. The UV visible spectrum of the enantiomers is shown in green in the top panel.
