MRK-016 is a selective, orally bioavailable inverse agonist of GABAA α5 receptor, with an EC50 of 3 nM for GABAA α5, and Kis of 0.83, 0.85, 0.77?and 1.4?nM for human?GABAA?α1β3γ2, GABAA?α2β3γ2, GABAA?α3β3γ2, and GABAA?α5β3γ2, respectively; MRK-016 also readily penetrates the CNS.
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