1 ZD2 (2s)-4-(6-amino-9h-purin-9-yl)-2-hydroxybutanoic acid 1.000 2 DEA D-eritadenine 0.944 3 3DD (2r,3r)-4-(4-amino-1h-imidazo[4,5-C]pyridin-1-yl)-2,3-dihydroxybutanoic acid 0.842 4 JYW 4-(6-azanyl-8-bromanyl-purin-9-yl)butan-1-ol 0.833 5 JYT 3-(6-azanyl-8-bromanyl-purin-9-yl)propan-1-ol 0.778 6 HGL (2s)-2-amino-4-(2-amino-6-oxo-1,6-dihydro-9h-purin-9-yl)butanoic acid 0.750 7 JXE 8-bromanyl-9-(4-bromanylbutyl)purin-6-amine 0.737 8 JXQ 9-hex-5-ynylpurin-6-amine 0.737 9 JXT 8-bromanyl-9-pent-4-ynyl-purin-6-amine 0.737 10 JY2 8-methyl-9-pent-4-ynyl-purin-6-amine 0.737 11 APS 9-hydroxypropyladenine, S-isomer 0.722 12 ARP 9-hydroxypropyladenine, R-isomer 0.722 13 2EC 9-ethyl-9h-purin-6-ylamine 0.706 14 JYN 9-(4-azidobutyl)purin-6-amine 0.700