| http://www.w3.org/ns/prov#value | - k and l, independently of one another, are each an integer from 0 to 1000, the sum of k and l being at least 5, R4 is hydrogen, C1-C30-alkyl or C5-C8-cycloalkyl, R5 is hydrogen or C1-C8-alkyl, Y2 is O or NR6, R6 being hydrogen, C1-C30-alkyl or C5-C8-cycloalkyl. k is preferably an integer from 1 to 500, in particular from 3 to 250. l is preferably an integer from 0 to 100.
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