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. 2016 Mar 8;11:10. doi: 10.1186/s13020-016-0080-2

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© Yang et al. 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Chiral HPLC analytical chromatograms of compounds 1–8. The retention times (min) for the two peaks of compounds 1–6 (95 % MeOH-H₂O, 0.7 mL/min; 276 nm) and 7–8 (75 % MeOH-H₂O, 0.5 mL/min; 276 nm) are marked on each chromatogram. The letters a–h successively stand for the profiles of 1–8