4FNC:
reference: Excision of 5-hydroxymethyluracil and 5-carboxylcytosine by the thymine DNA glycosylase domain: its structural basis and implications for active DNA demethylation., Hashimoto H, Hong S, Bhagwat AS, Zhang X, Cheng X, Nucleic Acids Res. 2012 Sep 8. PMID: 22962365

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