L-tyrosinamide, N~2~-acetyl-N~6~-[5-[(3aS,6aR)-hexahydro-2-oxo-1H-thieno[3,4-d]imidazol-4-yl]-1-oxopentyl]-L-lysyl-N-[6-[[(1S)-1-(2-amino-2-oxoethyl)-3-[(2,6-dimethylbenzoyl)oxy]-2-oxopropyl]amino]-6- oxohexyl]-3-[125I]iodo-