7-((4-Methylphenyl)sulfonyl)benzimidazo[2',1':6,1]pyrido[2,3-b]quinoxalin-6-amine 7-((4-Methylphenyl)sulfonyl)benzimidazo[2',1':6,1]pyrido[2,3-b]quinoxalin-6-ylamine AIDS-139365 AIDS139365 NSC648405