| http://www.w3.org/ns/prov#value | - e-2,3,5,6-tetracarboxylic acid, and 7-oxabicyclo (2.2.1) hepta-5-ene-2,3-dicarboxylic acid; and derivatives of the unsaturated carboxylic acids such as acid anhydrides, esters, amides, imides and metal salts, for example, maleic anhydride, itaconic anhydride, citraconic anhydride, haimic anhydride, monoethyl maleate, monomethyl fumarate, monomethyl itaconate, dimethylaminoethyl methacrylate, dimet
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