4-Bromo-N-(2-phenyl-4H-pyrazolo[5,1-f]pyrido[1,2-b][1,2,4]triazin-4-ylidene)aniline AIDS-138228 AIDS138228 N-(4-Bromophenyl)-N-(2-phenyl-4H-pyrazolo[5,1-f]pyrido[1,2-b][1,2,4]triazin-4-ylidene)amine NSC644644