L-Leucyl-L-prolyl-L-prolyl-L-seryl-L-arginine

**L-Leucyl-L-prolyl-L-prolyl-L-seryl-L-arginine** is a synthetic pentapeptide composed of the amino acids leucine, proline (twice), serine, and arginine. It is classified as a protein-based therapy under peptides. This compound is also known as the lymphocyte activating pentapeptide, suggesting potential immunomodulatory activity. However, detailed pharmacological mechanism of action and clinical indications are not well documented or publicly available. It appears to be an experimental biotech peptide with no established approved uses or marketed formulations.

Other names

L-arginine, l-leucyl-l-prolyl-l-prolyl-l-seryl-(2S)-2-[[(2S)-2-[[(2S)-1-[(2S)-1-[(2S)-2-amino-4-methylpentanoyl]pyrrolidine-2-carbonyl]pyrrolidine-2-carbonyl]amino]-3-hydroxypropanoyl]amino]-5-(diaminomethylideneamino)pentanoic acid