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Structures of nicotine 1, epibatidine 2, anabaseine 3, 2-(3-pyridyl)-3,4,5,6-tetrahydropyrimidine (PTHP) (4), 3-(2,4-dimethoxybenzyl)-(±) anabaseine (DMXBzAi) (5), 2-(4-pyridyl)-3-(2,4-dimethoxybenzylidene)-4,5,6,-tetrahydropyridine (DMXB IsoA) (6), and benzylidene anabaseines 7–26.
