(2Z,3E)-2-{[1-(4-Chloro-benz-yl)-1H-indol-3-yl]methylidene} quinuclidin-3-one oxime

In the title compound, C₂₃H₂₂ClN₃O, the benzene ring of the 4-chorobenzyl group makes a dihedral angle of 78.56 (6)° with the best plane of the indole ring. The double bond connecting the aza-bicyclic and indole groups adopts a Z geometry. The geometry adopted by the C=N bond with respect to the N - OH bond is trans. The absolute configuration of the compound was determined from refinement of the Flack parameter.