2-[5-[[(Trifluoromethyl) sulfonyl] oxy]-1 H-indol-3-yl] ethylamine (18), its N, N-di-n-propyl (12), N, N-diethyl (13), and N, N-dimethyl (14) derivatives, and 4-[3-[2-(N, N-dimethylamino) ethyl]- 1 H-indol-3-yl]-N-(p-methoxybenzyl) acrylamide (GR46611, 19) were synthesized and tested for binding affinities to cloned 5-HT1A, 5-HT1Dα, 5-HT1Dβ, and D2 receptors. In addition, the intrinsic efficacy was measured as the reduction of forskolin-stimulated cAMP in cells ...