Patent 8,383,379 (February 26, 2013), "Copolymer Comprising
4-Hydroxybutyrate Unit and Lactate Unit and its Manufacturing Method," Si Jae Park, Taek Ho Yang, Hye-Ok Kang, Sang-Hyun Lee, Eun-Jeong Lee, Tae-Wan Kim, and Sang-Yup Lee (LG Chem, Ltd., Seoul, South Korea).
A component of wine, ethyl
4-hydroxybutyrate, may explain its ability to reduce emotional tension, relieve anxiety, and produce relaxation.