The invention relates to metabolically labile water-insoluble esters of formula (I), wherein R.sup.1 is an aliphatic, araliphatic, aryl or heterocyclic group; R.sup.2 is hydrogen or an aliphatic, aryl or araliphatic group; R.sup.3 is as defined for R.sup.1, or R.sup.3 and R.sup.2 together form an alkylene chain; the molecule containing at least one iodine atom and being metabolised to form products which are soluble in body fluids. The esters are used in X-ray and ultrasound image enhancement.
本发明涉及公式(I)的代谢不稳定的
水不溶性酯,其中R1是脂肪族,芳基脂肪族,芳基或杂环基;R2是氢或脂肪族、芳基或芳基脂肪族基团;R3如R1定义的那样,或R3和R2一起形成一个烷基链;该分子含有至少一个
碘原子,并在代谢过程中形成可溶于体液的产物。该酯用于X射线和超声图像增强。