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UV/vis-HPLC trace (λ = 230 nm) for (semi)preparative separation of compound (R/S)-1. Chiralpak IA (250 mm × 1 cm, 5 μm), n-Hex/MTBE 4:1 (v/v), flow rate of 5 mL/min, 25 °C. Injection volume: 100 μL; concentration: 30 mg/mL. According to the UV profile, the fractionation was performed following the dashes (first eluted from A to B, mixed fractions from B to C, and second eluted from C to D).
