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Figure 2 Section of a strand generated by a 21 screw (with intra- and intermolecular hydrogen bonds shown as green and black dashed lines, respectively); interlinking of such strands by additional N—H⋯O(amide) and O(phenolic)—H⋯O(phenolic) hydrogen bonding is indicated by yellow dashed lines. C atoms (black) are shown as a stick model; O (red), N (blue), H(—O) and H(—N) atoms are shown as spheres of arbitrary size. H(—C) atoms are omitted for clarity. |