Used primarily as a protecting group reagent in organic synthesis, especially in peptide and nucleotide synthesis. Its main application lies in the protection of carboxylic acid groups, where it forms stable derivatives that can be selectively removed under mild basic conditions. This allows for precise control in multi-step syntheses, minimizing unwanted side reactions. It is particularly valued in solid-phase synthesis and combinatorial chemistry due to its compatibility with various functional groups and ease of monitoring by UV detection.