Used primarily in peptide synthesis, this compound serves as a protecting group for cysteine residues. It ensures the thiol group of cysteine remains stable during the synthesis process, preventing unwanted side reactions. The FMoc group is particularly useful in solid-phase peptide synthesis, as it can be easily removed under mild basic conditions. The trityl (Trt) group offers additional protection for the thiol group, which is selectively removed later in the synthesis. This chemical is essential for producing peptides with high purity and precise sequences, especially in the development of pharmaceuticals and biochemical research.