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. Author manuscript; available in PMC: 2015 Jun 1.
Published in final edited form as: Bioorg Med Chem Lett. 2014 Apr 13;24(11):2469–2472. doi: 10.1016/j.bmcl.2014.04.014

Figure 2.

Figure 2

X-ray structure of (R)-2 highlighting stereochemistry at C6 (crystallographic numbering). Nitrogen atoms are shown in blue, and oxygen atom is shown in red.