Patent ID: 7732558

Claim:
A dendritic compound of structure (I): PD n -Z-L (I) wherein P is X—(CH 2 CH 2 —O) r —, r is an integer equal to 1 or greater than 1, X is OH, NH 2 or OR, and R is C 1 to C 10 alkyl; Dn is a residue selected from the group consisting of 2,2-bis(hydroxymethyl)propionic acid, D 1 having a structure of formula (I): D 2 having a structure of formula (II): D 3 having a structure of formula (III): L is a metal cation; and Z is a residue of ethylenedinitrilo tetraacetic acid (EDTA), ethylenedilmino dibyric acid (EDBA), or a compound having a structure of formula (IV):