| http://www.w3.org/ns/prov#value | - as R1 and R2 is a 3- to 10-membered saturated or unsaturated heterocyclic group containing at least one of a nitrogen atom, an oxygen atom, a sulfur atom and a selenium atom, which may be a monocyclic ring or may further be condensed with other ring(s), preferably a 3- to 10-membered aromatic heterocyclic group containing at least one of a nitrogen atom, an oxygen atom, a sulfur atom and a seleniu
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