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. Author manuscript; available in PMC: 2009 Oct 6.
Published in final edited form as: Tetrahedron Lett. 2008 Oct 6;49(41):5931–5934. doi: 10.1016/j.tetlet.2008.07.155

Figure 1.

Figure 1

Crystal structure for the tetracyclic compound 17. Carbon: gray; oxygen: red; hydrogen: pale gray; bromine: gold.