4'-hydroxy Flurbiprofen (FPH) is primarily utilized in the field of pharmaceutical research and development. It serves as a major metabolite of Flurbiprofen, a nonsteroidal anti-inflammatory drug (NSAID). Researchers study FPH to better understand the pharmacokinetics and metabolic pathways of Flurbiprofen in the human body. This helps in assessing the drug's efficacy, safety, and potential side effects. Additionally, FPH is used in analytical chemistry as a reference standard in high-performance liquid chromatography (HPLC) and mass spectrometry (MS) to quantify and identify Flurbiprofen and its metabolites in biological samples. Its role in drug metabolism studies is crucial for optimizing therapeutic doses and improving drug formulations.