| http://www.w3.org/ns/prov#value | - The electron-shifting substituents Y1 and Y2 in formula (VII) include the hydroxy group, alkoxy groups containing 1 to 4 carbon atoms, aryloxy groups, the nitro group, halogen atoms, such as fluorine, chlorine, bromine and iodine, the amino group which may even be mono- or dialkylated or mono- or diarylated, linear or branched alkyl groups containing 1 to 4 carbon atoms, cycloalkyl groups containi
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