| http://www.w3.org/ns/prov#value | - an enhancing reagent which is an organic enhancing compound or synergistic mixtures of an inorganic salt such as NaCl, MgCl.sub.2, KCl, CaCl.sub.2, sodium phosphate, sodium acetate, ammonium acetate and ammoniumsulfate and the organic enhancing reagents.Organic compounds useful as enhancing reagents are of the structure ##STR3## wherein each R is independently selected from the group consisting of
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