| http://www.w3.org/ns/prov#value | - The method of claim 1 wherein the unsaturated fatty acid or lower alkyl ester thereof is a compound of the general formula: RCOOR' (1) wherein R is a monovalent hydrocarbon group containing 1 to 3 double bonds and having 15 to 17 carbon atoms, and R' is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. 5.
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