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β-Cyclodextrin (β-CD) and p-hydroxybenzaldehyde (p-HB) were studied by 1H-NMR in deuterated aqueous solution and the stoichiometry of the resulting complex (1:1) was determined by the continuous variation method. Inclusion of p-HB in β-CD was confirmed by the observation of NMR shifts for the inside H5 protons of the β-CD cavity. In the solid state X-ray analysis was carried out and revealed the detailed...