Synthesis of L thyroxine is described, L tyrosine, as the starting material, was iodized with powdered iodine and hydrogen peroxide to yield L 3,5 diiodotyrosine.

• 以L-酪氨酸为起始原料,用碘粉和双氧水碘化制备3,5-二碘-L-酪氨酸,再将氨基和羧基加以保护,经孵化反应制备高纯度、具生物活性的L-甲状腺