1KJH:
reference: Substrate shape determines specificity of recognition for HIV-1 protease: analysis of crystal structures of six substrate complexes., Prabu-Jeyabalan M, Nalivaika E, Schiffer CA, Structure (Camb) 2002 Mar;10(3):369-81. PMID: 12005435

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