trans-2-Undecenal-d₅ is deuterated labeled 4-Vinylphenol (HY-W005288). 4-Vinylphenol is found in the medicinal herb Hedyotis diffusa Willd, wild rice and is also the metabolite of p-coumaric and ferulic acid by lactic acid bacteria in wine. 4-Vinylphenol induces apoptosis and inhibits blood vessels formation and suppresses invasive breast tumor growth in vivo^[1].