Figure 33: Affinities ( = nM) of 3,6-disubstituted β-carbolines at αβ3γ2 ( = 1–3, 5, 6) receptor subtypes [85]. The structures versus code numbers of all ligands in the tables of this review can be found in the Ph.D. thesis of Terry Clayton (Ph.D. thesis, University of Wisconsin-Milwaukee, Milwaukee, WI, December, 2011) [22] and in the Supporting Information.