下圖為甲狀腺素共同結構式，何者為L-thyroxine？
AR1 = R2 = R3 = R4 = I正確答案
BR1 = R2 = R3 = I; R4 = H
CR1 = H; R2 = R3 = R4 = I
DR1 = R3 = I; R2 = R4 = H
答案與詳解
為什麼答案是 A
L-thyroxine即T4，為3,5,3',5'-tetraiodothyronine，四個取代位置（R1、R2、R3、R4）全部為碘原子，符合T4結構定義。
考點：T4結構/四碘考點：T3結構混淆考點：非標準取代型考點：T2結構/二碘
載入中…
