What is "diiodotyrosine"

diiodotyrosine \di*i`o*do*tyr"o*sine\, di-iodotyrosine \di-iodotyrosine\n. (Chem., Med.) a chemical substance consisting of tyrosine with two hydrogen atoms on the benzene ring replaced by iodine atoms.

Note: The isomer 3,5-diiodotyrosine is an inhibitor of thyroid function.

Diiodotyrosine (DIT) is a precursor in the production of thyroid hormone, and results from iodization of monoiodotyrosine at the other meta- position on the phenol ring.