Potent positive allosteric modulator of GABAA receptors. Enhances GABA-evoked chloride currents in Xenopus oocytes expressing GABAA receptors (EC50 values are 94, 122 and 213 nM for α2β1γ2L, α3β1γ2L and α1β1γ2L receptors respectively). Exerts anticonvulsive effects in a broad range of animal seizure models.