LevothyroxineEthyl Ester,Ethyl (S)-2-amino-3-(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoate,An analog of Thyroxine with stimulatory effects on human red blood cell membrane Ca2+-activated ATPase. It is a potential inactivator of iodothyronine deiodinase type II.,Levothyroxine