| http://www.w3.org/ns/prov#value | - A typical example of the latter is a case where R.sup.4 (or R.sup.5 or R.sup.6) forms a condensed 6-membered ring sharing a double bond of the cyclopentadienyl group, that is, this conjugated 5-membered cyclic group is an indenyl or fluorenyl group.
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