??? ????? [[2-(6-Amino-9H-purin-9-yl)ethoxy]methyl]phosphonic acid diethyl ester Adefovir dipivoxil Diethyl (tosyloxy)methylphosphonate Propanoic acid, 2,2-dimethyl-, [[[[2-(6-amino-9H-purin-9-yl)ethoxy]methyl]hydroxyphosphinyl]oxy]methyl ester Propanoic acid, 2,2-dimethyl-, [[[[2-(6-amino-9H-purin-9-yl)ethoxy]methyl]ethoxyphosphinyl]oxy]methyl ester Adefovir iMpurity (((2-(6-aMino-9H-purin-9-yl)ethoxy)Methyl)phosphoryl)bis(oxy)bis(Methylene) isopropyl dicarbonate Adefovir dipivoxyl impuritiesb (adefovir dipivoxyl dimer ) 2-(6-Aminopurin-9-yl)ethanol Adefovir ((hydroxy((2-(6-pivalaMido-9H-purin-9-yl)ethoxy)Methyl)phosphoryl)oxy)Methyl pivalate Adefovir Impurity 30 6-(BETA-HYDROXYETHYLAMINO)-PURINE 2,2-Dimethylpropanoic acid 1,1'-[[[[2-[6-[(2,2-dimethyl-1-oxopropyl)amino]-9H-purin-9-yl]ethoxy]methyl]phosphinylidene]bis(oxymethylene)] ester Adefovir Dipivoxil Impurity 20 ADEFOVIR-D4 Adefovir Disoproxil Dimer Impurity