| http://www.w3.org/ns/prov#value | - wherein x is an integer ranging from 3 to 100, for example, from 5 to 80, such as from 7 to 25; R1 is chosen from hydrogen and linear and branched C1???C6 alkyl groups (such as methyl) and R4 is chosen from linear and branched C6???C22 hydrocarbon-based chains, such as C10???C22 alkyls.
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