2A0P:
reference: Syntheses of 4'-thioribonucleosides and thermodynamic stability and crystal structure of RNA oligomers with incorporated 4'-thiocytosine., Haeberli P, Berger I, Pallan PS, Egli M, Nucleic Acids Res 2005 Jul 18;33(13):3965-75. Print 2005. PMID: 16027443

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