1 CG2 Cytidyl-2'-5'-phospho-guanosine 1.000 2 U2G Uridylyl-2'-5'-phospho-guanosine 0.951 3 UPA Uridylyl-2'-5'-phospho-adenosine 0.881 4 GPG Guanylyl-2',5'-phosphoguanosine 0.844 5 ZNT 2'3'-cua 0.745 6 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 0.735 7 4UR 3'2'-cgamp 0.735