2M84:
reference: Backbone FCHO Hydrogen Bonds in 2'F-Substituted Nucleic Acids., Martin-Pintado N, Deleavey GF, Portella G, Campos-Olivas R, Orozco M, Damha MJ, Gonzalez C, Angew Chem Int Ed Engl. 2013 Sep 23. doi: 10.1002/anie.201305710. PMID: 24115468

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