Pterin derivatives are described having the formula (I) ##STR1## wherein R represents a hydroxyphenyl group, a radioiodinated hydroxyphenyl group, a tyraminocarbonyl group, a radioiodinated tyraminocarbonyl group, a proteinocarbonyl group or a carboxy group; Q represents a straight or branched chain alkylene group having 1 to 6 carbon atoms; and R.sub.6 and R.sub.7 each represents a hydrogen, an alkyl group having from 1 to 6 carbon atoms, a hydroxyalkyl group having from 1 to 6 carbon atoms; and a radioimmunoassay method is described using a radioiodinated 4-hydroxy-2-tyraminopteridine derivative or a radioiodinated 4-hydroxy-2-tyraminocarbonylalkylaminopteridine derivative as the tracer.
                            本文描述了具有公式(I)的Pterin衍
生物:##STR1## 其中R代表一个羟基苯基,一种放射性
碘化的羟基苯基,一种酪
氨酰基基团,一种放射性
碘化的酪
氨酰基团,一种蛋白质
氨基酰基团或一个羧基;Q代表一个具有1至6个碳原子的直链或支链烷基;R.sub.6和R.sub.7分别代表氢、具有1至6个碳原子的烷基、具有1至6个碳原子的羟基烷基或一种放射性免疫分析方法,其使用一种放射性
碘化的
4-羟基-2-酪
氨基
喹啉衍
生物或一种放射性
碘化的
4-羟基-2-酪
氨酰基烷基
氨基
喹啉衍
生物作为示踪剂。