Edoxudin15176-29-131 % similar 5-Chlorouridine2880-89-931 % similar 5-Ethynyl-2′-deoxyuridine61135-33-930 % similar Trifluridine70-00-830 % similar Uracil-5-carboxylic acid monohydrate69727-34-030 % similar L-Uridine26287-69-430 % similar