Pressinoic acid is primarily used in biochemical research to study the structure and function of vasopressin and related peptides. It serves as a key intermediate in the synthesis of vasopressin analogs, which are investigated for their potential therapeutic effects in conditions like diabetes insipidus, hypertension, and certain bleeding disorders. Additionally, pressinoic acid is utilized in peptide chemistry to explore receptor binding mechanisms and to develop novel compounds with enhanced biological activity. Its role in understanding peptide hormone interactions makes it valuable in both pharmacological and physiological studies.