L-CYSTEINE, S-TRITYL (3,3-D2) is a protected cysteine derivative in which the thiol side chain of L-cysteine is masked as an S-trityl thioether bearing deuterium substitution at the 3,3-positions of the trityl group. The molecule retains the amino and carboxyl functional groups of the cysteine scaffold while the side-chain sulfur is incorporated into a trityl-protected linkage, and the deuteration pattern is confined to the trityl aromatic framework rather than the amino acid backbone. This isotopically labeled, side-chain-protected amino acid is used as a precursor for controlled cysteine incorporation in peptide synthesis and for analytical or chemical biology workflows that require a deuterium-labeled handle for tracking, mass spectrometric characterization, or structure-activity studies.
CAT No: L-Iso-0194
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