L-4-Hydroxyphenyl-3,5-d2-alanine

L-4-Hydroxyphenyl-3,5-d2-alanine is a deuterium-labeled derivative of the amino acid L-tyrosine, specifically deuterated at the 3 and 5 positions of the phenyl ring. It is used as a reference compound in analytical research, particularly for mass spectrometry and metabolic studies where isotopic labeling aids quantification.