L-CITRULLINE (5-13C; 4,4,5,5-D4) is an isotopically labeled, non-essential amino acid derivative of citrulline featuring the ureido-containing side chain characteristic of arginine-family amino acids. The molecule retains the free amino and carboxyl functional groups of citrulline while incorporating a 13C label at the specified position and deuterium atoms at the 4,4,5,5 positions, enabling isotopic tracking without altering the overall connectivity of the side chain. It is used as a stable-isotope tracer and analytical standard for studying amino acid handling, quantifying citrulline-related species by mass spectrometry, and supporting structure-activity or metabolic labeling workflows in biochemical and chemical biology research.
CAT No: L-Iso-0165
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