Nucleoside diphosphate

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nucleoside diphosphate

The pyrophosphoric ester of a nucleoside, i.e., a nucleoside in which the H of one of the ribose hydroxyls (usually the 5') is replaced by a pyrophosphoric (diphosphoric) radical; e.g., adenosine 5'-diphosphate.

Compare: nucleoside bisphosphate.