... and Imidazo[4,5-c]pyridines by Nitration of 4-Acylaminopyridines JM Bakke* and J. Riha 1143 Department of Organic Chemistry, Norwegian University ... [6] JB Campbell, JM Greene, ER Lavagnino, DN Gardner, AJ Pike, J. Snoddy and E. С Taylor, J. Heterocyclic Chem., 23,669 ...