AIDS-138939 AIDS138939 Methyl (2E)-2-hydrazono-3-(6-nitro-3-oxo-3,4-dihydroquinoxalin-2-yl)-4,5-dioxo-5-[(5-thioxo-2,5-dihydro- 1H-1,2,4-triazol-3-yl)amino]pentanoate NSC646797