| http://www.w3.org/ns/prov#value | - The alkenyl group is not limited, and is preferably a group of the formula: ##STR10## wherein R1 is a group selected from divalent organic groups of the formulas: ##STR11## (wherein R2, R3 and R4 are a divalent hydrocarbon group having 1 to 20 carbon atoms.), and a is 0 or 1.
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