4E5H:
reference: Structural and Biochemical Basis for Development of Influenza Virus Inhibitors Targeting the PA Endonuclease., Dubois RM, Slavish PJ, Baughman BM, Yun MK, Bao J, Webby RJ, Webb TR, White SW, PLoS Pathog. 2012 Aug;8(8):e1002830. Epub 2012 Aug 2. PMID: 22876176

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