Abstract: The compounds of the present invention are represented by general formula (I) in which formula R1 and R2 stand independently for one or more, similar or different substituents selected from the group consisting of hydrogen, halogen, hydroxy, mercapto, trifluoromethyl, amino, alkyl, alkoxy, alkylthio, alkylamino, or alkoxycarbonyl, the C-content of which can be from 1 to 5, cyano, carboxy, carbamoyl, phenyl, or nitro; R3 stands for hydrogen, halogen, hydroxy, mercapto, trifluoromethyl, amino, alkyl, alkoxy, alkylthio, alkylamino, or alkoxycarbonyl, the C-content of which can be from 1 to 5, phenyl, cyano, carboxy, or carbamoyl; R4, R5 and R6 stand independently for hydrogen, trifluoromethyl, alkyl, carbamoyl, alkoxycarbonyl, or alkyloxo, the C-content of which can be from 1 to 5; X stands for oxygen, N—OH, N—O-alkyl, dialkoxy, cyclic dialkoxy, dialkylthio, or cyclic dialkylthio, the C-content of which can be from 1 to 5.

Abstract: The present invention relates to hitherto unknown compounds of formula (I) or their tautomeric forms, the attachment to the pyridine being in the 3- or 4-position, in which formula R1 stands for one or more substituents which can be the same or different and are selected from the group consisting of: hydrogen, halogen, trifluoromethyl nitro, amino, cyano, carboxy, or alkyl, alkoxy, or alkoxycarbonyl, the C-content of which can be from 1 to 4; X stands for a straight or branched C9-C20 carbon chain, saturated or unsaturated or Q—Ar—R; in which formula Ar stands for phenyl, Q stands for a C5-C20 divalent hydrocarbon radical which can be straight, branched, saturated or unsaturated and R stands for hydrogen or for one or more substituents which can be the same or different and are selected from the group consisting of: hydroxy, amino, halogen, trifluoromethyl, cyano, nitro, carboxy, carbamoyl, or alkyl, alkoxy, alkylthio, alkylamino, or alkoxycarbonyl, the C-content of which can be from 1 to 4; and p