prov:value
| - those having following structures: where x is the chain length, i.e., about 1 or greater, R is one of an alkyl group having from about 1 to about 20 carbons, preferably about 1 to about 12 carbons, a phenyl group, or a cyclic group, R1 is an alkyl group having about 1 to about 12 carbon atoms, a phenyl group, or a cyclic group, and R2 is an alkyl group having about 1 to about 12 carbon atoms (str
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