H-Phe-Trp-OH

H-Phe-Trp-OH (CAS 24587-41-5), also referred to as Phe-Trp, Phe-Trp-OH, L-Phe-L-Trp, and Dipeptide 4, is a synthetic dipeptide composed of L-phenylalanine and L-tryptophan linked by a single peptide bond. It carries no assigned E-code. Molecular formula: C20H21N3O3.

In pharmaceutical and biotechnology research, H-Phe-Trp-OH serves as a carrier and solubilising agent for active compounds, leveraging the amphiphilic character of its aromatic side chains to improve formulation stability. It is also employed in peptide synthesis workflows as a defined building block and in nutritional research as a model dipeptide for studying intestinal absorption mechanisms.

H-Phe-Trp-OH is supplied as a solid in research and commercial grades, with documentation available to support REACH compliance requirements. It does not hold an FCC or Ph.Eur. monograph designation. Packaging is typically offered in gram to kilogram quantities depending on application requirements.