| http://www.w3.org/ns/prov#value | - sub.1-6-alkyl and R.sup.2 is H.Further preferred are compounds of formula (I-b) according to any one of the embodiments as described hereinabove, wherein either R.sup.3 is C.sub.1-6-alkyl and R.sup.2 is H or R.sup.3 is H and R.sup.2 is a halogen, and in particular Cl, in the6-position o
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