Z-D-Pyr-OH is primarily used in peptide synthesis as a protecting group for the carboxyl function of amino acids. It helps in preventing unwanted side reactions during the formation of peptide bonds, ensuring the synthesis proceeds smoothly and selectively. This compound is particularly valuable in the production of complex peptides and proteins, where precise control over the reaction sequence is crucial. Additionally, it finds application in the development of pharmaceuticals, enabling the creation of peptide-based drugs with high specificity and efficacy. Its stability under various reaction conditions makes it a reliable choice for researchers and chemists working in organic and medicinal chemistry.