( + ) -cyclaradine has in vitro activity nearly equivalent to that of phosphonoformate but is significantly less active than acycloguanosine ( acyclovir ; acv ) , trifluorothymidine , or 9- ( 1,3-dihydroxy-2-propoxymethyl ) guanine .
C0001367
acyclovir
C0018321
guanine