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. Author manuscript; available in PMC: 2008 Oct 15.
Published in final edited form as: Bioorg Med Chem Lett. 2007 Aug 19;17(20):5715–5719. doi: 10.1016/j.bmcl.2007.07.060

Figure 1.

Figure 1

Structures of improgan and related congeners which have antinociceptive properties. The general schematic formula for improgan-like compounds is given at the top.