4NPT:
reference: Structures of darunavir-resistant HIV-1 protease mutant reveal atypical binding of darunavir to wide open flaps., Zhang Y, Chang YC, Louis JM, Wang YF, Harrison RW, Weber IT, ACS Chem Biol. 2014 Jun 20;9(6):1351-8. doi: 10.1021/cb4008875. Epub 2014 Apr 28. PMID: 24738918

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