5BRN:
reference: Synthesis and Evaluation of Novel Acyclic Nucleoside Phosphonates as Inhibitors of Plasmodium falciparum and Human 6-Oxopurine Phosphoribosyltransferases., Kaiser MM, Hockova D, Wang TH, Dracinsky M, Postova-Slavetinska L, Prochazkova E, Edstein MD, Chavchich M, Keough DT, Guddat LW, Janeba Z, ChemMedChem. 2015 Oct;10(10):1707-23. doi: 10.1002/cmdc.201500322. Epub 2015 Aug , 25. PMID: 26368337

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