Novel Selenium derivatives of thyroxine and tri-iodothyronine have the formula: ##STR1## wherein M is I or H and either (a) R.sub.1 is OH or a carboxyl protecting group and R.sub.2 contains at least one Se, preferably .sup.75 Se, atom or (b) R.sub.2 is H or an amino protecting group and R.sub.1 contains at least one Se, preferably .sup.75 Se, atom. The compounds are useful in dual isotope assays of thyroid function.
甲状腺素和三
碘甲状腺素的新型
硒衍
生物的
化学式为:##STR1## 其中 M 为 I 或 H,且 (a) R.sub.1 为 OH 或羧基保护基,R.sub.2 至少含有一个 Se,优选为.sup.75 Se,或 (b) R.sub.2 为 H 或
氨基保护基,R.sub.1 至少含有一个 Se,优选为.sup.75 Se。这些化合物可用于甲状腺功能的双同位素测定。