(-)-Thyroxine 3,3',5,5'-Tetraiodo-L-thyronine 51-48-9 L-Thyroxine L-Tyrosine, O-(4-hydroxy-3,5-diiodophenyl)-3,5-diiodo- Levothyroxine NSC36397 T4 T4 (pharmaceutical) THX Tetraiodothyronine Thyratabs Thyreoideum Thyroxin Thyroxine Thyroxine iodine Thyroxine, L- d-Thyroxine