CHELATING COMPOUNDS AND THEIR USE

摘要

The present invention provides a chelating compound of the formula: (R-NHOC-CH2)n-A-(CH2COOH)m (I) wherein R is an aromatic ring-containing organic group, A is a residue of an aminopolyacetic acid excluding acetic acid groups (-CH2COOH) therefrom, m is an integer of at least two and n is an integer of 1 or 2, or its salt, which has a specificity to a hepatobiliary system so that a chelate compound formed between said chelating compound and a metallic element through a chelate bond is useful as a diagnostic or therapeutic agent for hepatobiliary organs and tissues.