| http://www.w3.org/ns/prov#value | - The composition according to claim 1, wherein the carboxylic acids and their derivatives are those of the formula: A(COOR')n wherein A is a hydrocarbon or heterocyclic compound residue which may be substituted or not, R' is a hydrogen atom or a substituted or unsubstituted hydrocarbon group and n is an integer of not less than 1, provided that at least one R' is a hydrogen atom except the case tha
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