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Boc-Leu-OH·H₂O (N-(tert-Butoxycarbonyl)-L-leucine monohydrate, CAS 200936-87-4) is the monohydrate crystalline form of Boc-protected L-leucine, a standard building block for introducing leucine residues in Boc-strategy solid-phase peptide synthesis (SPPS).

Boc-Gly-OtBu (N-(tert-Butoxycarbonyl)glycine tert-butyl ester, CAS 111652-20-1) is a doubly protected derivative of glycine featuring both a Boc (tert-butoxycarbonyl) protecting group on the amino group and a tert-butyl ester protecting group on the carboxyl terminus.

Boc-L-2-aminobutyric acid (also known as Boc-L-Abu-OH or (S)-2-(Boc-amino)butyric acid) is a Boc-protected unnatural amino acid featuring a tert-butyloxycarbonyl (Boc) group protecting the α-amino functionality and an ethyl side chain at the α-carbon. The molecular formula is C₉H₁₇NO₄ with a molecular weight of 203.30 g/mol.

Boc-Gly-Gly-OH (N-(tert-butoxycarbonyl)glycylglycine) is a Boc-protected dipeptide consisting of two glycine residues linked by an amide bond, with a tert-butyloxycarbonyl (Boc) group protecting the N-terminal amino functionality. The molecular formula is C₉H₁₆N₂O₅ with a molecular weight of 232.23 g/mol. The structure features a tert-butyloxycarbonyl group that serves to shield the glycine residues during complex peptide assembly processes.

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.