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Chromatograms of the chiral HPLC separation of (S)- and (R)-2 and (S)- and (R)-3. Conditions: (a) Column: CHIRALPAK IB, (b) Mobile phase composition: ACN/aq. 20 mM NH4OAc (46/54, v/v for (S)- and (R)-2 and 34/66, v/v for (S)- and (R)-3), (c) CD detection at 285 nm.
