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Dimer and tetramer of peptide 1a. Hydrogen-bonded dimer subunit (upper). Blue arrows illustrate intramolecular and intermolecular NOEs observed in the NOESY spectrum. Sandwich-like tetramer consisting of two hydrogen-bonded dimers (lower). The blue arrow illustrates the interlayer NOEs observed in the NOESY spectrum. The tetramer exhibits four-fold symmetry and four I11–HaoOMe interactions, even though only one arrow is shown.
