The molecule is an L-alpha-amino acid that is L-valine in which all five carbons are (13)C isotopes while the nitrogen is the (15)N isotope. It is a L-alpha-amino acid, a valine, a (13)C-modified compound and a (15)N-modified compound.
(2S)-2-(15N)azanyl-3-(113C)methyl(1,2,3,4-13C4)butanoic acid