| http://www.w3.org/ns/prov#value | - b each, independently of the others, is an integer which is 0, 1, 2, or 3, wherein in embodiments, a and b are each zero; wherein R5 and R6 are each optionally present and wherein each of R5 and R6 independently of the other, if present, are independently selected from (i) an alkyl group, (ii) an aryl group, (iii) an arylalkyl group, (iv) an alkylaryl group, (v) a halogen atom, (vi) an ester grou
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