| http://www.w3.org/ns/prov#value | - Two vicinal radicals R1A-R5A together with the E1A-E5A bearing them may form a heterocycle, preferably a heteroaromatic, containing at least one atom from the group consisting of nitrogen, phosphorus, oxygen and sulfur, particularly preferably nitrogen and/or sulfur, with the E1A-E5A present in the heterocycle or heteroaromatic preferably being carbon atoms.
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