Balboni, G., Salvadori, S., Trapella, C., et al. (2010) Evolution of the bifunctional lead μ agonist/δ antagonist containing the 2’,6’-dimethyl-L-tyrosine-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid (Dmt-Tic) opioid pharmacophore. ACS Chemical Neuroscience, 1, 155-164.