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. Author manuscript; available in PMC: 2011 Oct 6.
Published in final edited form as: J Am Chem Soc. 2010 Oct 6;132(39):13879–13885. doi: 10.1021/ja1062532

Figure 4.

Figure 4

The crystal structure of heptamer 5, based on a crystal grown from isopropanol: (a) overlay of two symmetry-independent molecules in the crystal, viewed perpendicular to the helical axis (top) and along the helical axis (bottom); (b) close packing between the two symmetry-independent molecules, viewed along the crystallographic a axis (top) and b axis (bottom), (c) close packing between two identical molecules, viewed along the crystallographic c axis (top) and b axis (bottom). Solvent molecules (isopropanol) are highlighted in cyan. Dashed lines indicate hydrogen bonds. Disordered atoms and most hydrogen atoms are omitted for clarity. Molecular surfaces for the two helical conformations are rendered as shaded areas.