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Retention times of (-)-2 and (+)-2 were 14.92 min and 16.60 min, respectively. Conditions of separation : (a) chiral column; CSP (R, R) Whelk-01 25 cm × 4.6 mm i.d. (b) eluting solvents; EtOH/hexane : 6/4 (v/v) with 0.1% TEA. (c) flow rate = 1 ml/min. (d) detector : UV (280nm)
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