L-739594 is a HIV-1 protease inhibitor, with an IC50 of 1.8 nM[1].
References
[1] Arun K Ghosh, et al. SYNTHESIS AND OPTICAL RESOLUTION OF HIGH AFFINITY P2-LIGANDS FOR HIV-1 PROTEASE INHIBITORS. Tetrahedron Lett. 1995 Jan 23;36(4):505-508. DOI:10.1016/0040-4039(94)02296-N