4-Penten-ol-d9 (Pent-4-en-1-ol-d9) is the deuterium labeled 4-Penten-1-ol (HY-W010639). 4-Penten-1-ol is commonly used as a flavor ingredient in various products, including food, beverages, and perfumes, and can also be used as a starting material for the synthesis of various organic compounds, including pharmaceuticals and agrochemicals. In addition, 4-Penten -1-ol has been investigated for its potential use as a biobased solvent due to its low toxicity and biodegradability, and its antimicrobial properties against certain bacteria and fungi, which may make it useful for developing new Antibacterial agents.