| http://www.w3.org/ns/prov#value | - If two substituents of the general formulae (for example A and B, R1 and R2 as well as R8 and R9) together form an alkylene or alkenylene group, then this group is straight-chain or branched and contains preferably 2 to 7, in particular 2 to 6, and very particularly preferably 2 to 5, carbon atoms.
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