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In our pursuit to identify selective ligands for Bz/GABA(A) receptor subtypes, a novel pyrazolo[1,5-a]pyrimidine derivative (4), the azaisostere of zolpidem, was synthesized and evaluated in vitro on bovine brain homogenate and on recombinant benzodiazepine receptors (alphaxbeta2/3gamma2, x = 1-3, 5) expressed in HEK293 cells. Compound 4 displayed affinity only for alpha1beta2gamma2 subtype (K(i) = 31 nM), and in an in-depth, in vivo study it revealed sedative and anxiolytic-like properties without any amnesic and myorelaxant effects in rodents.
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Selleri et al. (2005) studied this question.
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