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Overlays of the 1H NMR spectra clearly show the similarities between the geometries of quasi[1]catenane 2-H2 and quasi[1]rotaxane 3, and also between spiro bicycle 1-H2 and monocycle 4. Furthermore, the structural dissimilarity between both C2-symmetric but diastereomeric spiro bicycle 1 and quasi[1]catenane 2-H2 is reflected by their spectra as is the case for quasi[1]rotaxane 3 and its unwound conformer 4.
