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Fmoc-Tle-OH is an N‑Fmoc‑protected derivative of L‑tert‑leucine, a non‑proteinogenic amino acid characterized by a bulky tert‑butyl side chain at the α‑carbon position. The tert‑butyl group (‑C(CH₃)₃) imposes significant steric hindrance around the α‑carbon, creating a highly congested chiral center that confers exceptional conformational restriction upon incorporation into peptide sequences.

Fmoc-Ser(PO(OBzl)OH)-OH is an Fmoc-protected L-serine derivative featuring a phosphorylated side chain protected by a benzyl (OBzl) group on the phosphate moiety. Structurally, the molecule consists of an L-serine core with the primary amine protected by a 9-fluorenylmethoxycarbonyl (Fmoc) group — the standard base-labile protecting group for solid-phase peptide synthesis (SPPS) — and the serine side chain hydroxyl group converted to a phosphate ester and protected with a benzyl group.

Fmoc-Chg-OH is an N‑Fmoc‑protected derivative of L‑cyclohexylglycine (L‑Chg‑OH), a non‑natural amino acid characterized by a bulky, hydrophobic cyclohexyl side chain at the α‑carbon position. Unlike the linear tert‑butyl group of L‑tert‑leucine, the cyclohexyl ring introduces a rigid, saturated six‑membered alicyclic scaffold that imposes well‑defined steric and conformational constraints upon incorporation into peptide sequences.

Fmoc-D-Trp(Boc)-OH is an Fmoc-protected D-tryptophan derivative bearing a Boc (tert-butoxycarbonyl) protecting group on the indole nitrogen of the tryptophan side chain. Structurally, the molecule consists of a D-configured tryptophan core, with the primary amine protected by a 9-fluorenylmethoxycarbonyl (Fmoc) group — a base-labile protecting group essential for solid-phase peptide synthesis (SPPS) — and the indole side chain protected by a Boc group to prevent undesired side reactions during chain assembly.

Fmoc-3,3-Diphenylalanine is a sterically hindered Fmoc-protected unnatural amino acid featuring two phenyl rings attached to the β-carbon of the alanine backbone. Structurally, the molecule comprises a fluorenylmethyloxycarbonyl (Fmoc) group protecting the α-amino functionality, a central chiral alanine-derived framework, and a geminal diphenyl substitution at the 3-position (Cβ). This unique 3,3-diphenyl substitution creates a highly congested structural motif with significant steric bulk around the side chain, imposing conformational constraints on the backbone when incorporated into peptides.

Fmoc-3-(4-thiazolyl)alanine (Fmoc-Tza-OH) is an Fmoc-protected unnatural amino acid featuring a 4-thiazolyl side chain attached to the alanine backbone. The molecule consists of a fluorenylmethyloxycarbonyl (Fmoc) group protecting the α-amino functionality, a central alanine-derived chiral center, and a thiazole heterocycle at the β-position. The thiazole ring introduces both aromatic character and a lone pair-bearing nitrogen atom, imparting unique electronic properties and metal-coordination capabilities that are highly valued in medicinal chemistry and peptide engineering.