4DMG:
reference: Identification and characterization of the Thermus thermophilus m5C methyltransferase modifying 23S rRNA base C1942., Larsen LH, Rasmussen A, Giessing AM, Jogl G, Kirpekar F, J Biol Chem. 2012 Jun 18. PMID: 22711535

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