2820-50-0 3,3',5'-Triiodo-L-thyronine 3,3',5'-Triiodothyronine 3,5,3'-Triiodo-L-thyronine 5817-39-0 L-Tyrosine, O-(4-hydroxy-3,5-diiodophenyl)-3-iodo- REVERSE TRIIODOTHYRONINE Triiodothyronine, reverse