5G4V:
reference: A quasi-cyclic RNA nano-scale molecular object constructed using kink turns., Huang L, Lilley DM, Nanoscale. 2016 Aug 18;8(33):15189-95. doi: 10.1039/c6nr05186c. PMID: 27506301

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