L-CYSTEINE-N-FMOC, S-TRITYL (13C3; 15N) is a protected cysteine derivative in which the amino group is masked as an N-Fmoc carbamate while the thiol side chain is protected as an S-trityl thioether, and the molecule bears isotopic labels at the cysteine carbon framework (13C3) and nitrogen (15N). The structure contains a carboxylic acid functional group, an Fmoc-protected nitrogen, and a trityl-protected sulfur that together control chemoselectivity by preventing unprotected amine and thiol participation during stepwise coupling chemistry. In peptide and chemical biology workflows, this isotopically labeled, orthogonally protected amino acid is used as a defined building block for solid-phase or solution-phase synthesis of peptides and labeled conjugates where retention of the side-chain sulfur functionality and incorporation of the 13C/15N labels are required for NMR, MS, or structure-activity studies.
CAT No: L-Iso-0196
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