| http://www.w3.org/ns/prov#value | - alkylphosphonato-oxy group), monoarylphosphono-oxy group (--OPO.sub.3 H(Ar), where Ar is an aryl group) and conjugated base group thereof (hereinafter referred to as arylphosphonato-oxy group), cyano group, nitro group,aryl group, alkenyl group, and alkynyl group.Specific examples of the alkyl groups in these substituents include the alkyl groups already listed as examples of Rx1 to Rx4 and R
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