| http://www.w3.org/ns/prov#value | - The term ???A1, A2, A3, A4 are independently from each other selected from carbon or nitrogen atoms to form together with the two carbon atoms in formula I a stable aromatic or heteroaromatic ring??? refers to a residue which can be derived from compounds such as benzene, pyrazine, pyridazine, pyridine, pyrimidine, triazine or tetrazine.
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