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Boc-L-Homophe-OH (N-Boc-L-homophenylalanine) is a Boc-protected unnatural amino acid featuring a tert-butyloxycarbonyl (Boc) group protecting the α-amino functionality and a homophenylalanine side chain — a phenylpropyl group extending from the α-carbon. The molecular formula is C₁₅H₂₁NO₄ with a molecular weight of 279.33 g/mol. The presence of the Boc group renders the amino group inert under a wide range of reaction conditions, allowing for selective manipulations at the carboxylic acid terminus or elsewhere in the molecule.

Boc-Asn-OH (Nα-(tert-Butoxycarbonyl)-L-asparagine, CAS 7536-55-2) is a Boc-protected derivative of the naturally occurring amino acid L-asparagine. The molecule features a tert-butyloxycarbonyl (Boc) protecting group attached to the α-amino group, safeguarding the amine functionality during peptide synthesis while leaving the carboxyl group and the side-chain carboxamide available for selective transformations.

Boc-D-Leu-OH·H₂O (N-Boc-D-leucine monohydrate, CAS 16937-99-8) is the N-Boc-protected, monohydrated crystalline form of the unnatural D-enantiomer of the essential amino acid leucine. The molecule features a tert-butyloxycarbonyl (Boc) protecting group attached to the α-amino group of D-leucine, safeguarding the amine during peptide synthesis while preserving the free carboxylic acid for coupling reactions.

Boc-methioninethiol acetate (CAS 139429-04-2) is a specialized Boc-protected amino acid derivative featuring a thioacetate functionality. The molecule incorporates a tert-butyloxycarbonyl (Boc) protecting group on the amino moiety, combined with a methionine-derived thiol framework that has been acetylated to form the thioacetate (S-acetyl) derivative.

Boc-Ala-OH (N-(tert-Butoxycarbonyl)-L-alanine) is a Boc-protected amino acid derivative featuring a tert-butyloxycarbonyl (Boc) protecting group attached to the α-amino group of L-alanine. The molecule consists of a central chiral carbon bearing an amino group (protected as a carbamate), a carboxylic acid, and a methyl side chain — the simplest chiral amino acid scaffold.

Boc-pGlu-OEt (N-Boc-L-pyroglutamic acid ethyl ester, also known as Boc-Pyr-OEt or ethyl (S)-1-Boc-5-oxopyrrolidine-2-carboxylate) is a protected L-pyroglutamic acid derivative. The molecule features a pyroglutamic acid core — a cyclic amino acid formed by intramolecular cyclization of glutamic acid — with a tert-butyloxycarbonyl (Boc) group protecting the ring nitrogen and an ethyl ester protecting the carboxylic acid.