1,4,2-Benzodithiazine-7-carboxylic acid, 6-chloro-3-(methylthio)-, 2-[[6-chloro-3-(methylthio)-1,1-dioxido-1,4,2-benzodithiazin-7-yl]carbonyl]-1-methylhydrazide, 1,1-dioxide AIDS-112880 AIDS112880 NSC661102