several water-soluble ester derivatives of acyclovir [ 9- [ ( 2-hydroxyethoxy ) methyl ] guanine ] , i.e. , the 2'-o-glycyl- , 2'-o-alpha-alanyl- , 2'-o-beta-alanyl- and 2'-o-3-carboxypropionyl esters , were synthesized and evaluated for their antiviral activity in cell culture .
C0001367
acyclovir
C0018321
guanine