4NFO:
reference: Click Modification of RNA at Adenosine: Structure and Reactivity of 7-Ethynyl- and 7-Triazolyl-8-aza-7-deazaadenosine in RNA., Phelps KJ, Ibarra-Soza JM, Tran K, Fisher AJ, Beal PA, ACS Chem Biol. 2014 Jun 16. PMID: 24896732

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).