6HK6:
reference: Crystal structure of human RIOK2 bound to a specific inhibitor., Wang J, Varin T, Vieth M, Elkins JM, Open Biol. 2019 Apr 26;9(4):190037. doi: 10.1098/rsob.190037. PMID: 30991936

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