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Keywords:

  • biochemistry;
  • cyclizations;
  • conformation dertermination;
  • oligonucleotides
Thumbnail image of graphical abstract

A remarkably stable base-stacked structure is shown by the 70-membered ring 2, which possesses only four nucleotide bases and is formed by efficient cyclization of the oligonucleotide conjugate 1. In the presence of alkali, 2 twists to bring the stilbene groups into close proximity, as indicated by an excimer emission upon irradiation.