The molecule is an oligopeptide composed of L-proline, L-arginine, L-tyrosine, L-valine, L-lysine, L-glutamine, L-asparagine, L-threonine, L-leucine, L-lysine, L-leucine, L-alanine and L-threonine joined in sequence by peptide linkages.
(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-4-amino-2-[[(2S)-5-amino-2-[[(2S)-6-amino-2-[[(2S)-2-[[(2S)-2-[[(2S)-5-(diaminomethylideneamino)-2-[[(2S)-pyrrolidine-2-carbonyl]amino]pentanoyl]amino]-3-(4-hydroxyphenyl)propanoyl]amino]-3-methylbutanoyl]amino]hexanoyl]amino]-5-oxopentanoyl]amino]-4-oxobutanoyl]amino]-3-hydroxybutanoyl]amino]-4-methylpentanoyl]amino]propanoyl]amino]-3-hydroxybutanoic acid