Acetic acid (2R,3R,4R,5R)-2-acetoxymethyl-5-[2-oxo-4-(2,4,6-triisopropyl-benzenesulfonyloxy)-2H-pyrimidin-1-yl]-4-propyldisulfanyl-tetrahydro-furan-3-yl ester

2'-deoxy-2'-mercaptocytidine hydrochloride