Used in research as a nucleobase analog, 5-Vinyluracil serves as a building block for modified nucleic acids. It enables the study of DNA and RNA structure and function by introducing reactive sites for crosslinking or labeling. Its vinyl group allows for post-synthetic modifications via click chemistry or radical reactions, making it valuable in developing functional oligonucleotides for diagnostics and antisense technologies. It is also explored in the design of smart probes and bioconjugates due to its ability to form covalent bonds with thiols or amines under mild conditions.