Molecular Formula C11H12N2O5, Purity ≥98%, Formula Weight 252.2, Synonyms: 2'-deoxy-5-ethynyl-uridine, 5-EdU, EdU, 2'-deoxy-5-Ethynyluridine; A nucleoside analog of thymidine that is used to monitor de novo DNA synthesis through click chemistry; can be detected using a fluorescent azide probe and copper catalysis using 1,3-dipolar cycloaddition.