prov:value
| - wherein R and R??? each, independently of the other, is hydrogen or methyl, and R1, R2, R3, R4, R5, R6, R7, R8, and R9 each, independently of the others, is an alkyl group, including linear, branched, cyclic, and unsaturated alkyl groups, typically with from 1 to about 22 carbons and preferably with from 1 to about 5 carbon atoms, although the number of carbon atoms can be outside of these ranges,
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