Burford, N. T., Livingston, K. E., Canals, M., Ryan, M. R., Budenholzer, L., Han, Y., Shang, Y., Herbst, J. J., OConnell, J., Banks, M., Zhang, L., Filizola, M., Bassoni, D. L., Wehrman, T. S., Christopoulos, A., Traynor, J. R., Gerritz, S. W., & Alt, A. (2015). Discovery, synthesis, and molecular pharmacology of selective positive allosteric modulators of the δ-opioid receptor. Journal of Medicinal Chemistry, 58(10), 4220-4229. https://doi.org/10.1021/acs.jmedchem.5b00007