| http://www.w3.org/ns/prov#value | - In an especially preferred embodiment, each Ar is ##STR29## R1 is H or alkyl or alkenyl containing from 1 to about 20 carbon atoms, each R is a hydrocarbyl group containing from 4 to about 300 carbon atoms, preferably from 7 to about 100 carbon atoms, and A is an amide or amide-containing group.
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