Uridine diphosphate choline

Uridine diphosphate choline is a phosphorylated nucleotide derivative featuring a uracil base linked to a ribose sugar via β-N-glycosidic bond, with a diphosphate bridge connecting the 5'-hydroxyl of ribose to the hydroxyl group of choline. The molecule contains a quaternary ammonium moiety in the choline component and two esterified phosphate groups forming a mixed anhydride linkage. This compound represents a synthetic byproduct in uridine-based API manufacturing pathways, arising from non-enzymatic phosphorylation of choline with uridine 5'-phosphate. Functions as an HPLC reference standard for uridine drug substance impurity profiling.