| 5LWJ: reference: A Stably Protonated Adenine Nucleotide with a Highly Shifted pKa Value Stabilizes the Tertiary Structure of a GTP-Binding RNA Aptamer., Wolter AC, Weickhmann AK, Nasiri AH, Hantke K, Ohlenschlager O, Wunderlich CH, Kreutz C, Duchardt-Ferner E, Wohnert J, Angew Chem Int Ed Engl. 2016 Nov 25. doi: 10.1002/anie.201609184. PMID: 27885761 |
This OCA 
Structure page
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(documentation).