prov:value
| - Aryl for R6 and R7 is taken to mean aromatic rings or ring systems having from 6 to 18 carbon atoms in the ring system, for example phenyl or naphthyl, each of which can optionally be substituted by one or more radicals such as halogen, e.g. fluorine, chlorine or bromine, cyano, nitro, amino, C1 -C4 -alkylamino, C1 -C4 -dialkylamino, hydroxyl, C1 -C4 -alkyl, C1 -C4 -alkoxy or other radicals.
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