L-CYSTEINE, S-P-MEBZ (15N) is an isotopically labeled, sulfur-containing amino acid derivative in which the cysteine side chain bears an S-linked protecting/benzyl-type group (S-P-MEBZ) while the amino acid backbone remains that of cysteine. The molecule contains an amino functional group and a carboxyl functional group, and the side-chain thiol is modified to the corresponding thioether/thiol-protected form; the presence of 15N indicates isotopic labeling at the nitrogen of the amino group. In research workflows, this labeled cysteine derivative is used as a substrate or building block for peptide and conjugate synthesis and for analytical methods such as mass spectrometry or NMR-based studies that benefit from nitrogen isotopic tracing.
CAT No: L-Iso-0193
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