4-(4-(Hydroxy(oxido)amino)phenyl)-6-imino-1-isonicotinoyl-3-methyl-1,4,6,7-tetrahydropyrazolo[3,4-d][1,3]thiazine AIDS-141757 AIDS141757 NSC657983 {4H-Pyrazolo[3,4-d][1,3]thiazin-6-amine,} 3-methyl- {4-(4-nitrophenyl)-1-[(4-pyridinyl)carbonyl]-}