| http://www.w3.org/ns/prov#value | - C., provided that at least one of these groups is an alkoxy group, preferably alkyl or alkoxy groups having 1 to 4 carbon atoms and morepreferably alkoxy groups,Y represents a linear or branched alkylene radical containing 1 to 8 carbon atoms, preferably a linear radical containing 2 to 4 carbon atoms or a branched radical containing 5 to 6 carbon atoms, more preferably a linear radical containing
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