DL-CYSTEINE (3,3-D2) is a deuterium-labeled cysteine derivative in which the amino acid skeleton corresponds to cysteine, featuring a thiol-containing side chain and both an amino group and a carboxyl group. The molecule bears a sulfhydryl (-SH) functional group on the side chain, and the "3,3-D2" designation indicates deuterium substitution at the 3-position carbon (the β-carbon bearing the side-chain sulfur), with the DL prefix indicating a racemic mixture of stereoisomers. As an isotopically labeled free amino acid, it is used in isotopic tracing, mass spectrometry-based analytical method development, and quantitative studies of amino acid incorporation, exchange, or derivatization where the deuterium label enables discrimination from unlabeled cysteine.
CAT No: L-Iso-0185
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