| http://www.w3.org/ns/prov#value | - They can be typified by the general formula: ##STR23## where x=1 or 2, n=0, 1 or 2; or a polymeric form of such a compound, where R is an alkyl radical, n and x are each integers from 1 to 4, and the average number of carbon atoms in all of the R groups is at least about 9 in order to ensure adequate solubility in oil.
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