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Boc-D-Phe-Pro-Arg-Pro-OH.HCl is a protected tetrapeptide consisting of four amino acid residues in the sequence D-Phe-Pro-Arg-Pro, with a tert-butyloxycarbonyl (Boc) protecting group at the N-terminus and the C-terminus as the free carboxylic acid, stabilized as the hydrochloride salt.

H-D-Lys(Boc)-OtBu.HCl is an orthogonally protected D-lysine derivative featuring a free α-amino group stabilized as the hydrochloride salt, a tert-butyloxycarbonyl (Boc) protecting group on the ε-amino side chain, and a tert-butyl ester (OtBu) at the C-terminus.

Boc-Lys(Boc)-ONp (Nα,ε-di-Boc-L-lysine 4-nitrophenyl ester) is a doubly protected lysine derivative featuring Boc protecting groups on both the α-amino and ε-amino groups, with a 4-nitrophenyl (ONp) ester activating the C-terminus. 

H-N-Me-Trp(Boc)-OAll Oxalate (tert-butyl (S)-3-(3-(allyloxy)-2-(methylamino)-3-oxopropyl)-1H-indole-1-carboxylate oxalate) is a specialized N-methylated tryptophan derivative featuring orthogonal protection of its three functional groups. The molecule incorporates an Nα-methyl group (H-N-Me), a Boc-protected indole nitrogen, and an allyl ester (OAll) protecting group at the C-terminus.

Boc-Val-OH (N-(tert-Butoxycarbonyl)-L-valine) is a Boc-protected derivative of the essential branched-chain amino acid L-valine. The molecule consists of a valine core with its α-amino group protected by a tert-butoxycarbonyl (Boc) group, while the carboxylic acid remains free for coupling reactions. This protection strategy renders the amino group inert under basic and nucleophilic conditions while allowing selective deprotection under acidic conditions (typically TFA).

Boc-Arg-OH·H₂O·HCl (Nα-(tert-butoxycarbonyl)-L-arginine hydrochloride monohydrate) is a protected arginine derivative featuring a tert-butoxycarbonyl (Boc) group protecting the α-amino group, presented as the hydrochloride salt monohydrate. The molecule consists of an L-arginine backbone with the α-amino group masked by the Boc carbamate, the guanidinium side chain intact, and the carboxylic acid presented as the free acid.