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A twelve-membered hydrogen-bonded ring and the resulting helical structure (see picture) in the tetrapeptide and an eight-membered hydrogen-bonded ring in the dipeptide illustrate the structural consequences of the incorporation of the novel β-amino acid derived from the Diels–Alder adduct of anthracene and dimenthyl fumarate.
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Winkler et al. (2001) studied this question.
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