2′-Azido-2′-deoxyuridine upon phosphorylation to 2′-azido-2′-deoxyuridine 5′-diphosphate becomes a mechanistic inhibitor of RDPR (bacterial ribonucleoside diphosphate reductase).2′-Azido-2′-deoxyuridine has recently been evaluated for its potential use as a sensitive multi-spectroscopic probe for nucleic acids.