Peptides are short polymers of amino acids. Peptides have a similar polymer structure to proteins, but are commonly shorter in length. The shortest peptides are dipeptides, consisting of two amino acids joined by a single peptide bond. There are also tripeptides, tetrapeptides, etc. In general, peptides have an amino end and a carboxyl end (unless they are cyclic). Peptides are synthesized by coupling the carboxyl group (or C-terminus) of one amino acid to the amino group (or N-terminus) of another. Due to the possibility of unwanted couplings by active side group of the amino acids, protecting these active side groups is necessary. Chemical peptide synthesis normally starts at the C-terminal end of the peptide and ends at the N-terminus.
- Gonadorelin (LH-RH)
- Leuprorelin (Leuprolide)