(R)-3-Aminobutyric acid hydrochloride is a chiral organic compound featuring a primary amine group and a carboxylic acid group on a four-carbon chain. It is the hydrochloride salt of the (R)-enantiomer of 3-aminobutyric acid, a non-proteinogenic amino acid. This compound is a white to off-white crystalline powder. This chiral building block is primarily used in the pharmaceutical industry as a key intermediate in the synthesis of various active pharmaceutical ingredients (APIs). Its most notable application is in the production of the antiepileptic and neuropathic pain medication pregabalin (Lyrica®), where it serves as a crucial chiral precursor. The (R)-configuration is essential for imparting the desired biological activity in the final drug molecule. It is also employed in the research and development of other bioactive molecules and peptidomimetics. As a bifunctional molecule containing both an amine and a carboxylic acid, it is a versatile synthon in organic chemistry, enabling further derivatization through amide bond formation or other reactions. It should be handled with standard laboratory precautions, avoiding inhalation and contact with skin and eyes.