1HHP:
reference: The three-dimensional structure of the aspartyl protease from the HIV-1 isolate BRU., Spinelli S, Liu QZ, Alzari PM, Hirel PH, Poljak RJ, Biochimie 1991 Nov;73(11):1391-6. PMID: 1799632

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