1HVC:
reference: Crystal structure of a tethered dimer of HIV-1 proteinase complexed with an inhibitor., Bhat TN, Baldwin ET, Liu B, Cheng YS, Erickson JW, Nat Struct Biol 1994 Aug;1(8):552-6. PMID: 7664084

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