The molecule is a dipeptide comprising tyrosine with a tyrosyl residue attached to the alpha-nitrogen and with each tyrosine residue being substituted at the 3- and 5-positions by iodine. It is a dipeptide and an organoiodine compound. It derives from a tyrosine.
2-[[2-amino-3-(4-hydroxy-3,5-diiodophenyl)propanoyl]amino]-3-(4-hydroxy-3,5-diiodophenyl)propanoic acid