1 9K8 [(2~{R},3~{S},4~{R},5~{R})-5-(6-aminopurin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methyl 4-ethyl-3-fluorosulfonyl-benzoate 1.000 2 9K5 [(2~{R},3~{S},4~{R},5~{R})-5-(6-aminopurin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methyl 3-fluorosulfonylbenzoate 0.939