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Overlay of the lowest energy conformation calculated for AAD, ADD, DAA, and DDA using molecular mechanics conformational searches.13 Intramolecular H-bonds (green) are observed between the terminal recognition units in all cases. The backbone is shown in gray, H-bond donor recognition units are in blue, and H-bond acceptor recognition units are in red. The terminal aromatic groups and solubilizing groups are omitted for clarity.
