thyroxine, t4, levothyroxine molecule. it is thyroid hormone, prohormone of thyronine t3, used to treat hypothyroidism. structural

thyroxine deficiency deiodinase disease drug gland globulin goitre graves hormone hyperthyroidism hypothyroidism iodine metabolism nitrogen prohormone skeletal stimulating tbg thyroid thyronine thyroxin tsh science medicine drawing flat icon hydrogen carbon oxygen organic chemistry structural formula atomic molecule structure chemical atom molecular vector levothyroxine molecule used treat hypothyroidism model