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Where It Makes an Impact – Key metabolite standard in studies of acetaminophen (paracetamol) – Valuable labelled compound in advanced polymer and dye synthesis In the Lab 4-Aminophenol-d₄ and its derivatives are trusted tools in scientific research: – Exploring acetaminophen metabolism in both rodents and humans – Serving as an internal standard for LC-MS/MS quantification in human blood – Enabling the design of deuterated ligands for enzyme receptor studies