1-Aminocyclopropanecarboxylic acid (ACC) is a naturally occurring amino acid analog and the immediate precursor to ethylene in the biosynthetic pathway of this vital plant hormone. Ethylene regulates numerous physiological processes in plants, including fruit ripening, senescence, and stress responses. ACC is extensively used in biochemical and plant physiology research to investigate ethylene signaling and effects by elevating ethylene levels in plant tissues. It also functions as a key intermediate and building block in organic synthesis for creating cyclopropane-containing amino acids and other complex molecules. These applications extend to pharmaceutical development, where it aids in designing enzyme inhibitors, receptor modulators, and novel bioactive compounds for studying protein interactions and biological pathways.