Z-D-Arg(Pmc)-OH · CHA contains a D-configured arginine amino acid framework bearing a guanidinium side chain and the alpha-carboxylic acid and alpha-amino functional groups, with the side-chain protected as a Pmc (2,2,5,7,8-pentamethylchroman-6-sulfonyl) derivative. The N-terminus is protected by a Z (benzyloxycarbonyl) carbamate, and the "· CHA" indicates an associated chiral acid form (as a salt/complex) that can influence handling and crystallization while preserving the protected amino acid structure. This protected amino acid is used as a building block for stepwise peptide synthesis and related peptide-derivative preparation, where the orthogonal protection pattern supports controlled deprotection and chemoselective coupling at the alpha-amino group.
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