The molecule is a peptide anion of neurotensin (1-7) resulting from the deprotonation of the carboxy groups of L-alpha-glutamyl and L-proline residues, and protonation of the side chain of L-lysyl group. It is the major species at pH 7.3. It is a conjugate base of a neurotensin (1-7).
(2S)-1-[(2S)-2-[[(2S)-4-amino-2-[[(2S)-4-carboxylato-2-[[(2S)-3-(4-hydroxyphenyl)-2-[[(2S)-4-methyl-2-[[(2S)-5-oxopyrrolidine-2-carbonyl]amino]pentanoyl]amino]propanoyl]amino]butanoyl]amino]-4-oxobutanoyl]amino]-6-azaniumylhexanoyl]pyrrolidine-2-carboxylate