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. Author manuscript; available in PMC: 2011 Nov 14.
Published in final edited form as: Tetrahedron Lett. 2009 Jan 14;50(2):212–215. doi: 10.1016/j.tetlet.2008.10.127

Figure 1.

Figure 1

Generic structure of 3,6-disubstituted-[1,2,4]triazolo[4,3-b]pyridazine 1 and our M1 antagonist screening lead 2.