the synthesis of potential `` '' combined prodrugs '' '' wherein phosphonoformate or phosphonoacetate was attached to the 5'-position of 2'-deoxyuridine , 2'-deoxythymidine , 5-iodo-2'-deoxyuridine ( idu ) , 5- ( 2-chloroethyl ) -2'-deoxyuridine ( cedu ) , or 5- ( 2-bromovinyl ) -2'-deoxyuridine ( bvdu ) or to the 3'-position of cedu is described .
C0020811
, 5-iodo
C0011535
'-deoxyuridi