tris(substituted phenyl) bismuth compounds of formula (I) and pharmaceutically acceptable salts thereof are useful x-ray radiographic imaging agents: ##STR1## wherein X.sub.1, X.sub.2 and X.sub.3 are as defined in the specification.
式(I)中的取代苯基
铋化合物及其药学上可接受的盐是有用的X射线放射成像剂:##STR1## 其中X.sub.1、X.sub.2和X.sub.3如规范中所定义。