[(R)-2-(2-Amino-6-oxo-1,6-dihydro-purin-9-yl)-1-methyl-ethoxymethyl]-phosphonic acid diisopropyl ester

(S)-2-amino-6-chloro-9-(2-((diisopropylphosphono)methoxy)propyl)purine

(R)-9-(2-hydroxypropyl)guanine

(R)-9-[2-(2-tetrahydropyranyloxy)propyl]2-amino-6-chloropurine

(R)-9-(2-hydroxypropyl)-N2-benzoylguanine