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Cho, S; Kim, S; Jin, Z; Yang, H; Han, D; Baek, N. I.; Jo, J; Cho, C. W. et al. (2011). “Isoliquiritigenin, a chalcone compound, is a positive allosteric modulator of GABAA receptors and shows hypnotic effects”. Biochemical and Biophysical Research Communications413 (4): 637–42. doi:10.1016/j.bbrc.2011.09.026. PMID21945440.