(2~{R},3~{S},4~{R},5~{R},6~{R})-6-[[[(2~{R},3~{S},4~{R},5~{R})-5-[2,4-bis(oxidanylidene)pyrimidin-1-yl]-3,4-bis(oxidany l)oxolan-2-yl]methoxy-oxidanyl-phosphoryl]oxy-oxidanyl-phosphoryl]oxy-3-fluoranyl-4,5-bis(oxidanyl)oxane-2-carboxylic acid

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