TRH.jpg Liothyronine Thyroxine(T3)三碘甲状腺原氨酸 Triiodothyronine Liothyronine Molecular Weight:650.97 Levothyroxine Thyroxine(T4)甲状腺激素 Levothyroxine Molecular Weight: 776.87 Thyrotropin-releasing hormone 甲状腺和甲状旁腺