2-(Methylthio)-6,7-dihydro-5H-[1,3,4]thiadiazolo[2,3-b][1,3]thiazin-4-ium- AIDS-156965 AIDS156965 Methyl 5H,6H,7H-4lambda~5~-[1,3,4]thiadiazolo[2,3-b][1,3]thiazin-2-yl sulfide hydroiodide NSC633553 (IODIDE SALT)