Trt-D-Phe-OH · DEA contains a D-configuration phenylalanine core bearing a trityl (Trt) protecting group on the amino functionality and a free carboxylic acid (-COOH), with the side chain presenting a benzyl/phenyl group typical of phenylalanine. The molecule is present as a salt with diethanolamine (DEA), and the Trt group provides steric and electronic protection to suppress undesired amine-related side reactions during peptide-coupling chemistry. It is used as a protected amino acid building block for controlled incorporation of a D-phenylalanine residue in stepwise peptide synthesis and for preparing stereochemically defined peptide-related intermediates and analogs for structure-activity studies or analytical method development.
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