| http://www.w3.org/ns/prov#value | - The invention relates especially to compounds of the formula I in which R has the meaning given above and is especially methyl, X has the meaning given above and m is O, n has an average value of from approximately 10 to approximately 17, especially from approximately 11 to approximately 12, and each of the radicals A1, A2 and A3, independently of the others, is especially hydrogen, or also alkano
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