5EW7:
reference: Pathogenic C9ORF72 Antisense Repeat RNA Forms a Double Helix with Tandem C:C Mismatches., Dodd DW, Tomchick DR, Corey DR, Gagnon KT, Biochemistry. 2016 Feb 22. PMID: 26878348

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