4GKK:
reference: Expanded use of sense codons is regulated by modified cytidines in tRNA., Cantara WA, Murphy FV 4th, Demirci H, Agris PF, Proc Natl Acad Sci U S A. 2013 Jun 18. PMID: 23781103

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