prov:value
| - wherein each R, independently of the others, is a hydrogen atom, an alkyl group, including linear, branched, cyclic, substituted, and unsaturated alkyl groups, typically with from 1 to about 22. carbons and preferably with from 1 to about 7 carbon atoms, although the number of carbon atoms can be outside of these ranges, and wherein in a specific embodiment, the R groups are all methyl groups, A i
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