| http://www.w3.org/ns/prov#value | - A tridentate derivative of a carboxylic acid or of a hydroxamic acid represented by formula IV, may be used in the practice of the present invention: ##STR4## In the compound represented by this formula, R may be hydroxyl or --NHOH; R' may be H, but preferably R' is a lipophilic moiety having of from 1 to about 18 carbon atoms and is selected from the group consisting of alkyl, cycloalkyl, alkenyl
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