Vinylphenol reductase is an enzyme that catalyses the reaction :
4-vinylphenol + NAD<sup>+</sup> + 3 H<sup>+</sup> â 4-ethylphenol + NADH
It is found in Brettanomyces bruxellensis, a yeast responsible of the presence of ethyl phenols in wine formed from p-coumaric acid.