Hypnotic effects and GABAergic mechanism of licorice (Glycyrrhiza glabra) ethanol extract and its major flavonoid constituent glabrol - Cho, S; Park, J H; Pae, A N; Han, D; Kim, D; Cho, N C; No, K T; Yang, H; Yoon, M; Shimizu, M; Baek, N I (Bioorg Med Chem, 2012)