5NXT:
reference: A Novel Form of RNA Double Helix Based on G.U and C.A(+) Wobble Base Pairing., Garg A, Heinemann U, RNA. 2017 Nov 9. pii: rna.064048.117. doi: 10.1261/rna.064048.117. PMID: 29122970

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