1-(2'-O-acetyl-5'-O-benzoyl-3'-C-cyano-3'-O-mesyl-β-D-ribofuranosyl)thymine

[(6R,8R,9R)-9-acetyloxy-4-amino-8-(5-methyl-2,4-dioxopyrimidin-1-yl)-2,2-dioxo-1,7-dioxa-2λ⁶-thiaspiro[4.4]non-3-en-6-yl]methyl benzoate