. Author manuscript; available in PMC: 2014 Feb 25.
Published in final edited form as: Bioorg Med Chem Lett. 2007 Oct 18;17(24):6734–6738. doi: 10.1016/j.bmcl.2007.10.052
© 2007 Elsevier Ltd. All rights reserved.
Figure 2.
Structures of compounds 3b and 4b.