FMOC-Dap(Boc)-OH is a common peptide building block. As lysine residue its 3-amino group is often used for carrying a tag moiety such as a fluorescent dye, a quencher or biotin.

Amino acids are the basic units of proteins, which are linked by peptide bonds to form polypeptide chains that fold into proteins with specific functions. There are 20 common standard amino acids in nature, primarily distinguished by their side chains (R-groups). These differences give amino acids different...