| http://www.w3.org/ns/prov#value | - ropylene, n-butylene, isopropylmethylene, and octylene, or arylene, such as arylene containing 6 to 20 carbon atoms, for example, phenylene and naphthylene; L2 is a linking group that does not adversely affect the desired properties of the coupler, and that is the same as or different from L1, and is typically O, ##STR4## R7 and R8 are individually hydrogen, alkyl, such as alkyl containing 1 to 20
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