Chemistry of imidazo[2,1-b][1,3,4]thiadiazoles
Imtiyaz Ahmed M. Khazia, Andanappa K. Gadad,Ravi S. Lamani and Bhoomendra A. Bhongade
Tetrahedron Volume 67, Issue 19, 13 May 2011, Pages 3289-3316
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http://dx.doi.org/10.1016/j.tet.2011.03.027