Water insoluble iodinated esters of formula (I), in which R.sup.1 is a substituted or unsubstituted C.sub.1-20 aliphatic, C.sub.7-20 araliphatic or C.sub.6-20 aryl group or a C.sub.1-20 heterocyclic group having one or more hereto atoms selected from O, S and N; R.sup.2 is hydrogen or a substituted or unsubstituted C.sub.1-6 aliphatic, C.sub.6-10 aryl or C.sub.7-20 araliphatic group; and R.sup.3 is a group as defined above for R.sup.1, which may be the same as or different from R.sup.1, or R.sup.2 and R.sup.3 together represent a substituted or unsubstituted C.sub.1-4 alkylene group, the molecule containing at least one iodine atom and being metabolisable to products which are soluble in body fluids and are physiologically acceptable. The esters are useful in X-ray and ultrasound imaging, especially liver and spleen imaging.
公式(I)中的
水不溶性
碘化酯,其中R.sup.1是取代或未取代的C.sub.1-20脂肪、C.sub.7-20芳基脂肪或C.sub.6-20芳基基团或具有一个或多个来自O、S和N的杂原子的C.sub.1-20杂环基团;R.sup.2是氢或取代或未取代的C.sub.1-6脂肪、C.sub.6-10芳基或C.sub.7-20芳基脂肪基团;R.sup.3是与R.sup.1相同或不同的上述定义的基团,或R.sup.2和R.sup.3一起表示取代或未取代的C.sub.1-4烷基基团,分子含有至少一个
碘原子,可代谢为在体液中可溶且生理上可接受的产物。这些酯在X射线和超声成像中很有用,特别是在肝脏和脾脏成像中。