| http://www.w3.org/ns/prov#value | - Alkyl, haloalkyl and alkoxy groups when present as substituents preferably have from 1 to 4 carbon atoms especially 1 or 2 carbon atoms.Preferably R<1> represents a hydrogen atom, ethyl or methyl, with a hydrogen atom being especially preferred.R<2> referably represents an optionally substituted phenyl group.
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