... that 9-chloro-2-(2-fluorophenyl)- [l,2,4]triazolo[l,5-c]quinazolin-5(6//)-one 1 displayed a very potent activity as a benzodiazepine antagonist [1], led us to investigate tricyclic heterocycles containing fused triazolo ... [10] HW Schmidt, G. Koitz and H. Junek, J. Heterocyclic Chem., 24 ...