2-Phenylbutyric acid-d5 is the deuterium labeled 2-Phenylbutanoic acid (HY-W017194). 2-Phenylbutanoic acid is a monocarboxylic acid. 2-Phenylbutanoic acid interacts with proteins. 2-Phenylbutanoic acid is used in the study of malignant lymphoma and HIV virus-related diseases[1][2].