| http://www.w3.org/ns/prov#value | - Further, another preferred compound is a compound in which the ring formed with Z is adamantylidene and the ring formed with Y is a heterocyclic, in particular, thiophene group, which may be substituted with aryl having 6 to 10 carbon atoms or alkoxyaryl having 7 to 14 carbon atoms (i.e., aryl having 6 to 10 carbon atoms substituted with alkoxyl having 1 to 4 carbon atoms).
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