. . . . "Preferred substituents in this case are halogen, especially chloro and bromo, C1-C4-alkyl, e.g., methyl, ethyl, n-propyl, n-butyl and tert-butyl, or C1-C4-alkyloxy, e.g., methoxy, ethoxy, n-propyloxy, n-butyloxy or tert-butyloxy." .