Dansyl-γ-aminobutyric acid (dansyl-GABA) cyclohexylammonium salt is a fluorescent derivative of the neurotransmitter γ-aminobutyric acid (GABA). It is primarily used as a reference standard or internal standard in analytical chemistry for the detection and quantification of amines and amino acids in biological samples via techniques such as high-performance liquid chromatography (HPLC) with fluorescence detection. The compound's strong fluorescence enables highly sensitive analysis, making it valuable in neurochemistry research to monitor GABA and other neurotransmitter levels. It also supports metabolic studies and pharmaceutical quality control for trace-level amine detection.