11-(4-Fluoro-6-(9H-purin-6-ylthio)-1,3,5-triazin-2-yl)isoindolo[1,2-b][1,3]benzothiazole 4-Fluoro-6-isoindolo[1,2-b][1,3]benzothiazol-11-yl-1,3,5-triazin-2-yl 9H-purin-6-yl sulfide AIDS-141948 AIDS141948 NSC658437