In the exo-chair configuration, the hydrogens H(15) on C5 and H(25) on C10 are positioned in closer chemical environments. This is due to the relatively symmetric spatial arrangement of the exo-chair structure, where the two hydrogens are equidistant from key functional groups and have minimal steric interactions. However, in the exo-boat configuration, the molecular geometry changes significantly, and the hydrogens H and H(26) on C10 come into a more similar chemical environment. This alignment in the boat form is likely due to the spatial proximity of these hydrogens on the same carbon, which becomes more pronounced as the boat configuration stabilizes.