Compounds of formula (VIII) wherein R.sup.1, r.sup.2, r.sup.3, r.sup.4 and R.sup.5 are each selected from hydrogen and an hydroxyl group and at least four are hydrogen; B is an alkylene chain of from 1 to 4 carbon atoms; R is selected from hydrogen and an alkyl group of from 1 to 4 carbon atoms; A is selected from a bond and a straight or branched, optionally substituted alkylene chain of 1 to 6 carbon atoms, and X.sup.1 and X.sup.2 are each selected from hydrogen and an iodine radioisotope. Compounds of this formula are of value as agents for use in the radioimmunoassay of corresponding genins of formula (V) and derivatives thereof. Also provided by the invention are a radioimmunoassay method utilizing compounds of formula (VIII) and a test kit suitable for use in performing the assay.
化合物的
化学式为(VIII),其中R.sup.1,r.sup.2,r.sup.3,r.sup.4和R.sup.5分别选择自氢和羟基,至少有四个是氢; B是1至4个碳原子的烷基链; R选择自氢和1至4个碳原子的烷基; A选择自键和1至6个碳原子的直链或支链,可选地取代的烷基链,X.sup.1和X.sup.2分别选择自氢和
碘放射性同位素。该式化合物可作为与
化学式(V)及其衍
生物相应的
基因素的放射免疫测定的试剂。发明还提供了一种利用该式化合物的放射免疫测定方法和适用于执行该测定的试剂盒。