prov:value
| - Preferably, at least one of R1 and R2 is selected from hydrogen and fluorine. [0037] Non-limiting examples of organic groups or moieties for R1 and/or R2 include vinyl, alkoxy, substituted alkoxy, aryloxy, substituted aryloxy, 1-styryl, 1-chlorovinyl, 1-fluorovinyl, nitrile, ester (i.e., ???COOR), 1-phenylvinyl, aldehyde, and ketone groups.
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