| http://www.w3.org/ns/prov#value | - In a particularly advantageous embodiment, R has from about 16 to about 18 carbon atoms, R' is hydrogen or an alkyl group of from 1 to about 7 carbon atoms or an alkenyl group of from 2 to about 7 carbon atoms, and R is an alkyl or alkenyl group of from about 5 to about 15 carbon atoms.
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