| http://www.w3.org/ns/prov#value | - Especially mentioned as a universal base is 3-nitropyrrole.In general, the term hetero denotes an atom other than carbon, preferably but not exclusively N, O, or S. Accordingly, the term heterocycloalkyl denotes an alkyl ring system having one or more heteroatoms (i.e., non-carbon atoms).
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