| http://www.w3.org/ns/prov#value | - proviso that when R.sup.4 is thiophenyl, it is not selected from group consisting of: unsubstituted thiophenyl, unsubstituted chloro-5-thiophenyl and unsubstituted bromo-5-thiophenyl; with the second proviso that when R.sup.4 is a phenyl, it is a
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