| http://www.w3.org/ns/prov#value | - The compound as claimed in claim 10, having the formula (Xn --M--O--QR2 --N═)p Z-- or Xn--M(--O--QR2 --N═Z)s where M is a lanthanide or actinide metal ion, X is a chelating group, n is 1 to 4, p is 1 to 4, and s is 1 to 4. 12.
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