Still other interesting compounds are those compounds of formula (I) wherein R4 is a halogen substituted in the 4 position relative to the NR3 moiety, R1 and R2 are each independently selected from hydrogen, hydroxy, C1-12 alkyl, C1-12 alkyloxy, C1-12 alkyl-carbonyl, C1-12 alkyloxycarbonyl, amino, mono- or di(C1-12 alkyl)amino, mono- or di(C1-12 alkyl)aminocarbonyl wherein each of the aforemention