The molecule is a pentapeptide comprising L-tryptophan, glycine, L-isoleucine, and two L-histidine residues coupled in sequence by peptide linkages. It has a role as an epitope.
(2S)-2-[[(2S)-2-[[(2S)-2-[[2-[[(2S)-2-amino-3-(1H-indol-3-yl)propanoyl]amino]acetyl]amino]-3-methylpentanoyl]amino]-3-(1H-imidazol-5-yl)propanoyl]amino]-3-(1H-imidazol-5-yl)propanoic acid