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2-Azetidinecarboxylic acid, 3,3-dimethyl-, (2S)- (CAS 1860033-50-6), also known as (S)-3,3-dimethylazetidine-2-carboxylic acid, is a chiral, non-proteinogenic α-amino acid built upon a strained four-membered azetidine ring. The molecule features a secondary amine within the ring, a carboxylic acid group at the 2-position, and two methyl groups at the 3-position that introduce significant steric hindrance. This unique combination of ring strain and steric bulk creates a highly rigid, conformationally constrained scaffold that is fundamentally different from natural amino acids. First synthesized as a target by De Kimpe, Boeykens, and Tourwé in 1998, this compound has since become a valuable tool in peptide chemistry, where its ability to restrict backbone flexibility makes it a powerful building block for designing peptides with enhanced target binding affinity and metabolic stability.

Fmoc-Lys(Trt)-OH (Nα-Fmoc-Nε-trityl-L-lysine, CAS 111061-54-2) is an orthogonally protected derivative of the essential amino acid L-lysine. The molecule features a 9-fluorenylmethyloxycarbonyl (Fmoc) group protecting the α-amino functionality and a trityl (Trt) group protecting the ε-amino side chain.

Fmoc-Orn(Trt)-OH (Nα-Fmoc-Nδ-trityl-L-ornithine, CAS 1998701-26-0) is an orthogonally protected derivative of the naturally occurring non-proteinogenic amino acid L-ornithine. The molecule features a 9-fluorenylmethyloxycarbonyl (Fmoc) group protecting the α-amino functionality and a trityl (Trt) group protecting the δ-amino side chain.

Benzo[1,2-b:4,5-b']difuran-2,6(3H,7H)-dione (also known as 3,7-dihydrobenzo[1,2-b:4,5-b']difuran-2,6-dione) is a fused heterocyclic compound featuring a central benzene ring flanked by two dihydrofuran-2-one rings. The molecule adopts a rigid, planar, ladder-type architecture with the molecular formula C₁₀H₆O₄ and a molecular weight of 190.15 g/mol. This π-extended fused ring system creates an extensively conjugated framework with two lactone carbonyl groups positioned symmetrically at the 2- and 6-positions.

2,5-Dihydroxy-1,4-benzenediacetic acid (also known as 2,5-dihydroxy-p-benzenediacetic acid) is a multifunctional organic compound featuring a central benzene ring substituted with two hydroxyl groups at the 2- and 5-positions and two acetic acid side chains at the 1- and 4-positions. With the molecular formula C₁₀H₁₀O₆ and a molecular weight of 226.18 g/mol, 2,5-Dihydroxy-1,4-benzenediacetic acid presents a symmetric, rigid aromatic core functionalized with four oxygen-containing groups—two phenolic hydroxyls and two carboxylic acids.

6-Bromo-3,4-dihydro-1H-quinolin-2-one (also known as 6-bromo-1,2,3,4-tetrahydro-2-quinolinone) is a brominated quinolinone derivative featuring a 3,4-dihydro-1H-quinolin-2-one core with a bromine substituent at the 6-position. With the molecular formula C₉H₈BrNO and a molecular weight of 226.07 g/mol, 6-Bromo-3,4-dihydro-1H-quinolin-2-one belongs to the quinolinone class of compounds—a family renowned for their diverse biological activities including antitumor, antimicrobial, antifungal, antiviral, antioxidant, anti-inflammatory, and anticoagulant properties.