25416-65-3 61333-06-0 L-Tyrosine, O-(4-hydroxy-3,5-diiodophenyl)-3,5-diiodo-, monosodium salt, hydrate Latequatro Letequatro Levo-Tiroxina Glaxo Levoroxin Levothroid Levothyroxine sodium Levotiron Monosodium L-thyroxine hydrate Tiroxina Tivoral