X-ray contrast media

摘要

This invention relates to compounds having the following general formula: <IMAGE> (I) in which n is an integer from 0 to 4; R1 and R2 represent independently from each other a radical of the formula -CONHR5 in which R5 is an alkyl radical having 1-4 carbon atoms or a hydroxyalkyl radical having 1-4 carbon atoms or a radical of the formula <IMAGE> in which R6 and R7 are alkyl radicals having 1-4 carbon atoms; and R3 and R4, independently from each other, represent a hydrogen atom or an alkyl radical having 1-4 carbon atoms.