| http://www.w3.org/ns/prov#value | - , or for a group ##STR6## wherein R7 and R8 are hydrogen or methyl, R9 is hydrogen or an optionally branched alkyl group having 1 to 40, preferably 1 to 20, carbon atoms, and n is a whole number from 1 to 60, with the proviso that if n is 1, then R8 exclusively stands for an optionally branched alkyl group having 1 to 40 carbon atoms.
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