has five different conformations due to the flipping of the non equivalent naphtyl moieties around the amide and aminomethyl junctions. These five conformations are reported in Fig. of Ref. Experimentally, only two (out of five) conformations of the apo form of amide naphtotube in apolar solvents can be distinguished from NMR experiments, indicating that in 2 the exchange occurs in a time scale that exceeds that of NMR (ns to ms). The structures represented in Fig. , taken from the Cambridge Structural Database, correspond the most symmetric ones for compounds 1 and 2.