Abstract Within the class of (4-pyridinyl) vinylpyridines developed by Abbott laboratories as potent neuronal nicotinic acetylcholine receptor ligands, p-PVP-MEMA ({(R)-2-[6-chloro-5- ((E)-2-pyridin-4-ylvinyl) pyridin-3-yloxy]-1-methylethyl} methylamine) is the lead compound of a novel series that do not display the traditional nicotinic-like pyrrole-ring but still possessing high subnanomolar affinity (K i 0.077 nm—displacement of [3 H](–) cytisine ...