prov:value
| - a monocyclic or polycyclic, substituted or unsubstituted ring system which has from 1 to 30 carbon atoms and may also contain heteroatoms selected from the group consisting of the elements Si, Ge, N, P, O, S, Se and Te, in particular N, O and S, and k is a natural number from 2 to 6, preferably 3 or 4, in particular 3, and j is a natural number from 1 to 4, preferably 1 or 2, in particular 2.
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