| http://www.w3.org/ns/prov#value | - If the compound represented by the general formula (19) has two or more groups having the skeleton of cyclopentadienyl as the ligand L, two of such groups having the skeleton of cyclopentadienyl may be bound together through a bridging group, for example, an alkylene, such as ethylene or propylene, a substituted alkylene, such as isopropylidene or diphenylmethylene, a silylene or a substituted sil
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