3GRR:
reference: Binding of adenosine-based ligands to the MjDim1 rRNA methyltransferase: implications for reaction mechanism and drug design., O'Farrell HC, Musayev FN, Scarsdale JN, Rife JP, Biochemistry. 2010 Mar 30;49(12):2697-704. PMID: 20163168

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