| http://www.w3.org/ns/prov#value | - Preference is furthermore given to compounds of the formulae (1) to (8) in which the indices m, n, p and q stand for 0, 1 or 2, particularly preferably for 0 or 1.In a particularly preferred embodiment, the structures of the formulae (1) to (8) are selected from the formulae (9a) to (24a): where R, R1, Ar, X, Y and q have the same meaning as described above.
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