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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