prov:value
| - Particularly preferred are the compounds of formula IA, ##STR5## wherein R1 is as herein above defined, X represents a chlorine or iodine atom, or a methoxy or ethoxy group, and L1, L2 and L3 each independently represent a hydrogen, fluorine or chlorine atom, or a methoxy, methyl, or trifluoromethoxy group, at least one of which is other than hydrogen.
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