| http://www.w3.org/ns/prov#value | - is an --N.dbd.CH-- group, R.sub.4 is an alkyl group or a phenyl or cyclohexyl group which may be substituted with an alkyl or alkoxy group at the p-positionthereof, R.sub.5 means a hydrogen atom or alkyl group, R.sub.6 denotes an alkyl group or ##STR7## R.sub.7 and R.sub.8 mean individually a hydrogen or halogen atom, hydroxyl, cyano, alkyl, dialkylamino, alkoxy or alkoxyalkoxy group, ##STR8## and
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