1 UPA Uridylyl-2'-5'-phospho-adenosine 1.000 2 U2G Uridylyl-2'-5'-phospho-guanosine 0.927 3 CG2 Cytidyl-2'-5'-phospho-guanosine 0.881 4 A1AWU [(2~{R},3~{R},4~{R},5~{S})-5-(6-aminopurin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methyl [(2~{R},3~{R},4~{S},5~{R})-2-(2-azanyl-6-oxidanylidene-1~{H}-purin-9-yl)-5-(hydroxymethyl)-4-oxidanyl-oxolan-3-yl] hydrogen phosphate 0.841 5 ZNT 2'3'-cua 0.841 6 GPG Guanylyl-2',5'-phosphoguanosine 0.783 7 9BG 2',5'-gpap 0.735 8 1SY Cgamp 0.714 9 1YC 2-amino-9-[(1r,3r,6r,8r,9r,11s,14r,16r,17r,18r)-16-(6-amino-9h-purin-9-yl)-3,11,17,18-tetrahydroxy-3,11-dioxido-2,4,7,10,12,15-hexaoxa-3,11-diphosphatricyclo[12.2.1.1~6,9~]octadec-8-yl]-1,9-dihydro-6h-purin-6-one 0.714 10 9UH (2r,5r,7r,8s,10r,12ar,14r,15r,15as,16r)-7-(2-amino-6-oxo-1,6-dihydro-9h-purin-9-yl)-14-(6-amino-9h-purin-9-yl)-2,10,15,16-tetrahydroxyoctahydro-2h,10h,12h-5,8-methano-2lambda~5~,10lambda~5~-furo[3,2-L][1,3,6,9,11,2,10]pentaoxadiphosphacyclotetradecine-2,10-dione 0.714 11 9UR (2s,5r,7r,8r,10s,12ar,14r,15r,15ar,16r)-7-(2-amino-6-oxo-3,6-dihydro-9h-purin-9-yl)-14-(6-amino-9h-purin-9-yl)-2,10,15,16-tetrahydroxyoctahydro-2h,10h,12h-5,8-methano-2lambda~5~,10lambda~5~-furo[3,2-L][1,3,6,9,11,2,10]pentaoxadiphosphacyclotetradecine-2,10-dione 0.714