| 摘要 |
<p>Peptides which include unnatural amino acids and which inhibit the secretion of gonadotropins by the pituitary gland and inhibit the release of steroids by the gonads. The peptides are analogs of the decapeptide GnRH wherein there is at least one residue of an unnatural amino acid U* in the 3-, 5- and/or 6-positions. Such unnatural amino acids are useful in the synthesis of peptides and can be formed after synthesis of the peptide chain. The unnatural amino acid U* can have a cyanoguanidino group on the omega carbon atom of the side chain, but preferably has formula U* (I) where j is 1 or 2 and R¿11? is H or an acyl radical having 1 to 6 carbon atoms.</p> |
