| 摘要 |
The present invention relates to hitherto unknown compounds of formula (I) or their tautomeric forms, the attachment to the pyridine ring being in the 3- or 4-position, in which formula R1stands for one or more substituents which can be the same or different and are selected from the group consisting of: hydrogen, halogen, trifluoromethyl, carboxy, C1-C4alkyl, alkoxy or alkoxycarbonyl, nitro, amino or cyano and Q stands for C 9-C20divalent hydrocarbon radical which can be saturated, straight or branched or Q stands for C4- C20divalent hydrocarbon radical which can be cyclic or unsaturated and X stands for oxygen, sulfur or nitrogen the latter optionally being substituted by hydrogen or C1- C4alkyl and R2stands for one or more substituents which can be the same or different and are selected from the group consisting of: hydrogen, C1-C 4 alkyl or alkoxy, hydroxy, halogen, trifluoromethyl, cyano, carboxamido, sulfamoyl or nitro; and pharmaceutically acceptable, non- toxic salts and N-oxides thereof. The present compounds are of value in the human and veterinary practice.
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