| http://www.w3.org/ns/prov#value | - The terms ???heterocycle??? and ???heterocyclic??? refer to a cyclic group, including ring-fused systems, including heteroaryl groups as defined below, in which one or more carbon atoms in a ring is replaced with a heteroatom???that is, an atom other than carbon, such as nitrogen, oxygen, sulfur, phosphorus, boron or silicon.
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