Bretazenil (Ro16-6028) is an imidazopyrrolobenzodiazepine anxiolytic drug which is derived from the benzodiazepine family and was invented in 1988. It is most closely related in structure to the benzodiazepine antagonist flumazenil although its effects are somewhat different. It is classed as a high-potency benzodiazepine due to its high affinity binding to benzodiazepine binding sites where it acts as a partial agonist.
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