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Introduction of small unsaturated alkylamino groups at the 4-position of the A-ring of the tricyclic framework (triazafluorenone) afforded extremely potent and selective mGluR1 antagonists with desirable properties. Compounds 11q and 11s are active in the SNL pain model with ED 50 s 3.3 and 6.4mg/kg respectively. Metabolic outcome of propargyl amino moiety was studied.