| http://www.w3.org/ns/prov#value | - (R1???O)n???R2 wherein n is a number from 1 to 3 inclusive, R1 and R2 are the same or are different from one another and are selected from the group consisting of substituted and unsubstituted alkyl, aryl, and alkylaryl groups, wherein at least one of R1 and R2 contains at least one fluorine atom, and at least one of R1 and R2 contains at least one hydrogen atom.
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