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. Author manuscript; available in PMC: 2012 Dec 7.
Published in final edited form as: Tetrahedron Lett. 2011 Dec 7;52(49):6643–6645. doi: 10.1016/j.tetlet.2011.10.012

Figure 1.

Figure 1

(a) Six possible types of hetero-fused benzopyranopyridines (b) and representative compounds with biological activities