| http://www.w3.org/ns/prov#value | - C6-C40-aryl radical or a C2-C40-heteroaromatic radical containing at least one heteroatom selected from the group consisting of O, N, S and P, in particular O, N and S, or the radical R3 is a C1-C40???, preferably C3-C20-alkyl radical like isopropyl, cyclobutyl, 1-methylpropyl, 1-methylbutyl, 1-ethylbutyl, 1-methylpentyl, cyclopentyl, cyclohexyl or t-butyl, in particular isopropyl.
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