2RPT:
reference: Structure of the cytosine-cytosine mismatch in the thymidylate synthase mRNA binding site and analysis of its interaction with the aminoglycoside paromomycin., Tavares TJ, Beribisky AV, Johnson PE, RNA. 2009 May;15(5):911-22. Epub 2009 Mar 27. PMID: 19329536

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