[(8S)-1-azabicyclo[2.2.2]octan-8-yl] acetate [(3S)-quinuclidin-3-yl] acetate acetic acid [(3S)-3-quinuclidinyl] ester acetic acid [(3S)-quinuclidin-3-yl] ester [(8S)-1-azabicyclo[2.2.2]octan-8-yl] ethanoate PDSP2_000679 PDSP1_000689 NCGC00024733-01 Tocris-0689