| http://www.w3.org/ns/prov#value | - ] Ar1 and Ar2 are the same or different and each independently comprise an aromatic group having from about 4 to about 20 carbon atoms; [0091] Z is selected from the group consisting of oxygen, sulfur, a carbon-carbon bond, [0092] wherein R may be aryl (having from about 6 to about 20 carbon atoms, such as phenyl) or acyl (having from about 2 to about 20 carbon atoms, such as acetyl, or benzoyl),
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