2YDH:
reference: RNA tertiary interactions in a riboswitch stabilize the structure of a kink turn., Schroeder KT, Daldrop P, Lilley DM, Structure. 2011 Sep 7;19(9):1233-40. PMID: 21893284

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