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Preclinical study demonstrates enhanced anxiolytic efficacy and stability of novel GABAA ligand KRM-II-81 in rodents, suggesting a safer alternative to conventional benzodiazepines.
1,4-Benzodiazepines are used in the treatment of anxiety disorders but have limited long-term use due to adverse effects. HZ-166 (2) has been shown to have anxiolytic-like effects with reduced sedative/ataxic liabilities. A 1,3-oxazole KRM-II-81 (9) was discovered from a series of six bioisosteres with significantly improved pharmacokinetic and pharmacodynamic properties as compared to 2. Oxazole 9 was further characterized and exhibited improved anxiolytic-like effects in a mouse marble burying assay and a rat Vogel conflict test.
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Poe et al. (2016) studied this question.
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