| http://www.w3.org/ns/prov#value | - The invention relates especially to compounds of the formula I in which R, X and m have the meanings given above, n has an average value of from approximately 10 to approximately 17, and each of the radicals A1, A2 and A3, independently of the others, is hydrogen, alk(en)oyl having up to and including 20 carbon atoms, alkoxycarbonyl having up to and including 20 carbon atoms in the alkyl moiety, w
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