| http://www.w3.org/ns/prov#value | - The phenylmoieties may optionally be substituted by alkyl, preferably C.sub.1 -C.sub.6 alkyl, halo, alkoxy, preferably C.sub.1 -C.sub.6 alkoxy, haloalkyl, preferably C.sub.1 -C.sub.6 haloalkyl, phenyl, phenoxy, nitro and amino moieties.However, when R is a group (2) perhaloalkyl compound, X is selected from the group consisting of hydroxy, halo, amino, alkyl, preferably C.sub.1 -C.sub.6 alkyl, hal
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