prov:value
| - where x and n are chain lengths, i.e., 1 or greater, n is about 1-12, such as about 2, R and R1 are independently chosen from linear or branched alkyl groups having about 1-20 carbon atoms, such as about 1-12 carbon atoms, phenyl group, cyclic group, or mixtures thereof, and R2 is hydrogen, methyl group, or mixture thereof;
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