N-Acetyl-D-leucine is a chiral derivative of the essential amino acid leucine, specifically the D-enantiomer modified with an acetyl group. It is a white crystalline powder with a molecular formula of C8H15NO3 and a molecular weight of 173.21 g/mol. This compound is characterized by its specific optical rotation, which is a key identifier for its enantiomeric purity. Its primary and most significant application is in the pharmaceutical and biomedical research fields. N-Acetyl-D-leucine is investigated as a potential therapeutic agent, most notably for the treatment of cerebellar ataxia. Clinical studies have explored its efficacy in improving symptoms associated with this neurological disorder. Furthermore, it serves as a valuable chiral building block (pharmaceutical intermediate) in the synthesis of more complex bioactive molecules and peptides, leveraging its defined stereochemistry. As a derivative of a proteinogenic amino acid, it is also relevant in biochemical studies related to metabolism, enzyme substrates, and as a standard in analytical chemistry for amino acid analysis. Handling should follow standard laboratory safety protocols for fine chemicals.