| http://www.w3.org/ns/prov#value | - wherein R9 is a hydrogen atom, an alkyl group, or an aryl group, R8 is an acyl group, a substituted, preferably alkylated, aminocarbonyl group, or preferably a cyano group, R7 is an optionally substituted alkyl or aryl group, for example a phenyl group which is substituted with chlorine or bromine atoms, methyl, ethyl, methoxy, ethoxy, nitro, hydroxy, trifluoromethyl, acyloxy or acylamino groups.
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