4OBH:
reference: HIV-1 protease-substrate coevolution in nelfinavir resistance., Kolli M, Ozen A, Kurt-Yilmaz N, Schiffer CA, J Virol. 2014 Jul;88(13):7145-54. doi: 10.1128/JVI.00266-14. Epub 2014 Apr 9. PMID: 24719428

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