L-CYSTEINE (2,3,3-D3; 15N) is an isotopically labeled, proteinogenic amino acid bearing a thiol-containing side chain and the standard amino acid backbone with both amino and carboxyl functional groups. The molecule is labeled with deuterium at the 2 and 3 positions of the cysteine skeleton and with 15N in the amino group, while retaining the L stereochemical form implied by the "L-" prefix and featuring a reactive sulfhydryl (-SH) that can form disulfides or undergo thiol-based derivatization under appropriate conditions. In biochemical and analytical workflows, it is used as an isotopic tracer or internal standard for mass spectrometry, NMR, and isotope-dilution studies, and it can be incorporated into peptide synthesis workflows where the labeled amino acid provides position-specific labeling for structure-function and labeling experiments.
CAT No: L-Iso-0183
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