(2S,4R)-4-aminopyrrolidine-2-carboxylic acid hydrochloride is a significant chemical compound with versatile applications in pharmaceutical synthesis and peptide chemistry. This compound, also known as (S,S)-4-Aminopyrrolidine-2-carboxylic acid hydrochloride, exhibits valuable reactivity and structural properties crucial for its use in the development of pharmaceuticals and peptide-based drugs.