respectively. While the affinity for α7 subtype was rather poor (Ki from 0.4 to >50 μM), the affinity for α4β2 subtype was very interesting, with nanomolar Ki values for the best compounds. The N-substituted cytisines were docked into the rat and human α4β2 nAChR models based on the extracellular domain of a molluscan acetylcholinebinding protein. The docking results agreed with the binding data, allowing