| http://www.w3.org/ns/prov#value | - R.sub.3 is hydrogen, lower alkyl, especially ethyl, halo, especially fluoro, chloro or bromo, lower alkoxy, especially methoxy, or unsubstituted or substituted C.sub.6-C.sub.14-aryl, especially phenyl, hydroxyphenyl or methoxyphenyl; R.sub.4 is hydrogen
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