| http://www.w3.org/ns/prov#value | - each occurrence of R1 is independently a monovalent hydrocarbyl group containing from 1 to about 6 carbon atoms, and optionally includes at least one heteroatom selected from the group consisting of oxygen and fluorine, and preferably each occurrence of R1 is independently a 1 to 4 carbon alkyl, a vinyl (???CH???CH2), an allyl (???CH2CH???CH2), or an aromatic group, and each R8 is a hydrogen or a
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