| http://www.w3.org/ns/prov#value | - f carbon atoms of the others, R5 and R6 each, independently of the other, are alkyl groups, including saturated, unsaturated, and substituted alkyl groups, preferably with from 1 to about 4 carbon atoms, more preferably with from 1 to about 3 carbon atoms, and even more preferably with from 1 to about 2 carbon atoms, although the number of carbon atoms can be outside of these ranges, with examples
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