| http://www.w3.org/ns/prov#value | - from 7 to 19 carbon atoms; and R.sub.2 is chosen from branched hydrocarbon-based groups comprising from 1 to 40 carbon atoms, such as from 3 to 20 carbon atoms, with the proviso that the total number of carbon atoms in R.sub.1 and R.sub.2 is greater than
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