| http://www.w3.org/ns/prov#value | - Aryl is preferably phenyl or phenyl substituted with one to five substituents, which can be the same or different, selected from hydroxy, C1-C2 alkoxy, halogen, cyano, nitro, methyl, ethyl, carboxy, amino, C1-C2 alkyl- or dialkylamino, or alkyl groups variously substituted with one to three substituents such as hydroxy, C1-C2 alkoxy, halogen, cyano, nitro, methyl, ethyl, carboxy, amino, C1-C2 alky
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