L-CYSTEINE-N-T-BOC, S-P-MEBZ (3,3-D2) is a protected cysteine derivative bearing an N-tert-butoxycarbonyl (N-Boc) group and a deuterium-labeled benzyl thioether side chain, where the sulfur is substituted with a (3,3-D2)-methylbenzyl (P-MEBZ) protecting/alkylating group. The molecule contains a free carboxyl functional group and a thioether at the cysteine side chain, while the Boc carbamate masks the amino functionality to control chemoselectivity during peptide coupling or other stepwise transformations. In synthesis and labeling workflows, it is employed as a protected, isotopically labeled amino acid building block for preparing cysteine-containing peptides and for mass-dependent analytical studies that require a defined deuterium tag on the sulfur-bearing substituent.
CAT No: L-Iso-0202
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