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The upper rim, C-linked and Cbz-protected cone calix[4]arene bis-l-alanyl derivative 2 forms self-assembled nanotubes in the solid state through a two-dimensional network of hydrogen bonds between the amide chains of adjacent conformers. The crystal lattice is quite different from that of the analogous N-linked derivative 1 which shows calix[4]arene macrocycles piled through van der Waals interactions.
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