L-4-HYDROXYPHENYL(ALANINE-2-13C);L-TYROSINE-ALPHA-13C;L-TYROSINE-CARBOXY-13C;L-TYROSINE (2-13C);L-TYROSINE-CARBOXY-13C, 99 ATOM % 13C;4-hydroxyphenylalanine-carboxy-13c
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