Patent ID: 7988950

Claim:
A compound of formula (II) 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 divalent straight or branched linker moiety comprising at most 20 carbon atoms, wherein L represents a linker of formula wherein n and n′ are, independently, 0 or an integer from 1 to 4, p, q and s are, independently, 0 or 1, or L represents a linker of formula wherein n, q and s are as defined above; together with the corresponding protonated forms of the phosphonate (—PO 3 H 2 ) and carboxy (—COON) groups, with the proviso that at least one of the R groups is other than H; or a physiologically acceptable salt of such ligand.