diisopropyl ({1-[(6-amino-9H-purin-9-yl)methyl]cyclopropyl}oxy)methylphosphonate
diisopropyl {[1-(hydroxymethyl)cyclopropyl]oxy}methylphosphonate
{1-[(diisopropylphosphoryl)methoxy]cyclopropyl}methyl methanesulfonate
diisopropyl {[1-({[tert-butyl(diphenyl)silyl]oxy}methyl)cyclopropyl]oxy}methylphosphonate