5FIU:
reference: Exploration of a potential difluoromethyl-nucleoside substrate with the fluorinase enzyme., Thompson S, McMahon SA, Naismith JH, O'Hagan D, Bioorg Chem. 2015 Nov 18;64:37-41. doi: 10.1016/j.bioorg.2015.11.003. PMID: 26642178

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