New triiodinated isophthalic acid diamides of the formula ##STR1## wherein the amide residues --CO--N.R.sub.1 R.sub.2 and --CO--N.R.sub.3 R.sub.4 are different from each other and R.sub.1 is hydrogen or C.sub.1-6 alkyl, R.sub.2 is mono- or polyhydroxyalkyl, R.sub.3 is hydrogen or C.sub.1-6 alkyl, R.sub.4 is mono- or polyhydroxylalkyl, R.sub.5 is C.sub.1-6 alkyl or mono- or polyhydroxy-C.sub.1-6 -alkyl or C.sub.1-3 -alkoxy-C.sub.1-3 -alkyl, and R.sub.6 is hydrogen, C.sub.1-6 alkyl or mono- or polyhydroxyalkyl provide superior nonionic X-ray contrast media.
新的三
碘异苯二酸二酰胺的
化学式为##STR1##其中酰胺残基--CO--N.R.sub.1 R.sub.2和--CO--N.R.sub.3 R.sub.4不同,R.sub.1为氢或C.sub.1-6烷基,R.sub.2为单或多羟基烷基,R.sub.3为氢或C.sub.1-6烷基,R.sub.4为单或多羟基烷基,R.sub.5为C.sub.1-6烷基或单或多羟基C.sub.1-6-烷基或C.sub.1-3-烷氧基-C.sub.1-3-烷基,R.sub.6为氢,C.sub.1-6烷基或单或多羟基烷基,可提供优越的非离子型X射线造影剂。