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. Author manuscript; available in PMC: 2016 Jul 1.
Published in final edited form as: Bioorg Med Chem. 2015 Apr 9;23(13):3603–3617. doi: 10.1016/j.bmc.2015.04.006

Figure 1.

Figure 1

HPLC was carried out using a Waters Delta 600 system consisting of the 600 Controller, 600 Fluid Handling Unit and 996 Photodiode Array Detector equipped with a Chiralpak IB column with dimensions 4.6 × 250 mm, 5 µm particle size. The mobile phase was isocratic: 40% ethyl acetate–60% hexane at a flow rate of 1.0 ml/min. Chromatographs indicate: A, compound 2; B, compound 3; C, compound 4; and D, compound 9. The retention times for isomers 3 and 4 were 5.9 and 6.6 min, respectively. The retention time for nonchiral compound 9 was 8.0 min.