1MUI:
reference: X-ray crystallographic structure of ABT-378 (lopinavir) bound to HIV-1 protease., Stoll V, Qin W, Stewart KD, Jakob C, Park C, Walter K, Simmer RL, Helfrich R, Bussiere D, Kao J, Kempf D, Sham HL, Norbeck DW, Bioorg Med Chem 2002 Aug;10(8):2803-6. PMID: 12057670

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