1 6UT [(2~{R},3~{S},4~{R},5~{R})-5-(2-azanyl-6-oxidanylidene-1~{H}-purin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methoxy-~{N}-[(2~ {S})-3-(1~{H}-indol-3-yl)-1-(methylamino)-1-oxidanylidene-propan-2-yl]phosphonamidic acid 1.000 2 6UR [(2~{R},3~{S},4~{R},5~{R})-5-(6-aminopurin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methoxy-~{N}-[2-(1~{H}-indol-3-yl)ethyl]P hosphonamidic acid 0.825 3 6US [(2~{R},3~{S},4~{S},5~{R})-5-(6-aminopurin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methoxy-~{N}-[2-(1~{H}-indol-3-yl)ethyl]phosphonamidic acid 0.825 4 V2S (2~{S})-2-[[[(2~{R},3~{S},4~{R},5~{R})-5-(6-aminopurin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methoxy-oxidanyl-phosphoryl]amino]-3-phenyl-propanoic acid 0.738