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. Author manuscript; available in PMC: 2018 Feb 15.
Published in final edited form as: Bioorg Med Chem Lett. 2016 Dec 31;27(4):994–998. doi: 10.1016/j.bmcl.2016.12.078

Figure 3.

Figure 3

Global conformational energy minima of 666-15 (A), 1a (B), 1b (C), 1c (D) and 1d (E). The yellow dotted line indicates a hydrogen bond and the corresponding interatomic distance is shown in Å. In panel (F), the conformations of 1a–1d are superimposed onto that of 666-15.