Method for preparing radiolabeled thymidine having low chromophoric byproducts
   
   

The invention is a method and related precursor for preparing .sup.18F-FLT. The precursor has a butoxycarbonyl protecting group at the 5'-position that results in low amounts of chromophoric byproducts being formed during deprotection. The method for preparing .sup.18F-FLT is efficient and makes the final purification step less complicated.

 
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