| http://www.w3.org/ns/prov#value | - One or more of the monosaccharide units of the deacetylated derivative of the p-GlcNAc of the invention may form a metal chelate, as depicted below: ##STR10## where R12 may be a metal ion, particularly one of the transition metals, and X is the dative bond established by the nitrogen electrons present in the amino and substituted amino groups present in the deacetylated p-GlcNAc.
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