6EHH:
reference: Crystal Structures and Inhibitor Interactions of Mouse and Dog MTH1 Reveal Species-Specific Differences in Affinity., Narwal M, Jemth AS, Gustafsson R, Almlof I, Warpman Berglund U, Helleday T, Stenmark P, Biochemistry. 2017 Dec 27. doi: 10.1021/acs.biochem.7b01163. PMID: 29281266

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