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H-bonded duplexes formed by oligomers with different recognition units and backbones (R is a solubilizing group).11 The oligomers are labeled according the type of recognition unit (phosphine oxide = PO, pyridine = N, pyridine N-oxide = NO), the site of attachment of the recognition units (C or N), and the number of atoms separating neighboring recognition units (7, 8, or 9).
