2RF3:
reference: Crystal structure of tricyclo-DNA: an unusual compensatory change of two adjacent backbone torsion angles., Pallan PS, Ittig D, Heroux A, Wawrzak Z, Leumann CJ, Egli M, Chem Commun (Camb). 2008 Feb 21;(7):883-5. Epub 2007 Dec 21. PMID: 18253536

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