| http://www.w3.org/ns/prov#value | - part and from 6 to 22, preferably from 6 to 10, carbon atoms in the aryl part, or R7 and R8 together with the atoms connecting them form a monocyclic or polycyclic, substituted or unsubstituted ring system which has from 1 to 40 carbon atoms and may also contain heteroatoms selected from the group consisting of the elements Si, Ge, N, P, O, S, Se and Te, preferably Si, N, O and S, in particular S
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