... J. Heterocyclic Chem., 23, 1071 (1986 ... the initial discovery of a series of 6-substituted- phenyl-1,2,4-triazolo[4,3-b]pyridazines with interesting anxiolytic properties [l] we have been interested in 6,5-fused nitrogen heterocycles with a ... 1074 DB Moran, G. 0. Morton and J. D. Albright ...