1FK9:
reference: Structural basis for the resilience of efavirenz (DMP-266) to drug resistance mutations in HIV-1 reverse transcriptase., Ren J, Milton J, Weaver KL, Short SA, Stuart DI, Stammers DK, Structure. 2000 Oct 15;8(10):1089-94. PMID: 11080630

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