| http://www.w3.org/ns/prov#value | - , and R is an alkyl or an oxygen substituted alkyl group having 1 carbon atoms, R, and R are either taken separately or are combined to form a divalent organic group such that the nitrogen atom of said structural formula is included in a 5, 6 or 7 membered ring, and R is an aromatic radical containing nitrogen in the ring, and an ester of an unsaturated dibasic acid having the formula I| 2l|-2 COZ
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