| http://www.w3.org/ns/prov#value | - R??? and R??? are typically the same and are selected for example from the group of linear or branched C1-C10 alkyl groups, in particular linear or branched C1-C6 alkyl groups, and most preferably from the group of ???CH3, ???C(CH3)3, ???CF3 and ???C(CF3)3, ii) cyclopentadienyl,
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