prov:value
| - wherein R5 and R6 each, independently of the other, is an alkyl group, typically with from 1 to about 6 carbon atoms, although the number of carbon atoms can be outside of this range, or an arylalkyl group, typically with from about 7 to about 12 carbon atoms, such as a benzyl group, although the number of carbon atoms can be outside of this range, and the like, wherein R1 is an alkylene group (in
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