Patent ID: 8540966

Claim:
A compound of formula (III) wherein: R is, independently, H or a C 2 -C 70 aminopolyol moiety comprising a straight or branched alkyl chain substituted by from 2 to 30 hydroxyl groups, said chain being optionally interrupted by one or more groups selected from —O—, —NH—, —N<, —CO—, —CONH—, —NHCO—, —CON< or >NCO—; and optionally substituted by one or more C 4 -C 10 cyclic units; L is, independently, a direct bond or a divalent straight or branched linker moiety between R and the rest of the molecule, comprising at most 20 carbon atoms; together with the corresponding protonated forms of the carboxy (—COOH) groups; or a physiologically acceptable salt of such ligand; with the proviso that at least one of the R groups is other than H.