| http://www.w3.org/ns/prov#value | - The ethers employed in the present invention are, in general, those having the following structural formula: R(OR-),,OR wherein n is an integer, usually between about 0 to 10 and preferably between about 1 to 3; R is a hydrocarbyl radical, R is either hydrogen or hydrocarbyl radical, when n is zero, R is a hydrocarbyl radical, when n is a whole integer, R is hydrogen or hydrocarbyl radical, and
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