| http://www.w3.org/ns/prov#value | - rings, cyclic hydrocarbons, such as benzene, and naphthalene or heterocyclic rings, such as furan, thiophene, pyrrole, pyran, thiopyran, pyridine, oxazole, isooxazole, thiazole, isothiazole, imidazole, pyrazole, pyrazine, pyrimidine, and pyridazine.
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