| http://www.w3.org/ns/prov#value | - arylalkyl radical containing from 1 to 20 carbon atoms, or two carbon atoms are joined together to form a C4 -C6 ring; each R' is a C1 -C4 substituted or unsubstituted alkylene radical, a dialkyl or diaryl germanium or silicon, or an alkyl or aryl phosphine or amine radical bridging two (C5 Rn) and (C5 Rm) rings; each Y is independently a hydrocarbyl radical such as aryl, alkyl, alkenyl, alkylary
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