4LQK:
reference: Characterization and structure of the vaccinia virus NF-kappaB antagonist A46., Fedosyuk S, Grishkovskaya I, de Almeida Ribeiro E Jr, Skern T, J Biol Chem. 2014 Feb 7;289(6):3749-62. doi: 10.1074/jbc.M113.512756. Epub 2013, Dec 19. PMID: 24356965

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