| 摘要 |
This invention relates to pyridine derivatives of the formulae: <IMAGE> in which R1 is hydrogen, lower alkyl, aralkyl optionally substituted on the aromatic nucleus with at least a halogen atom or a hydroxy, nitro, amino, cyano, carboxy, alkoxycarbonyl, lower alkyl, lower alkoxy or trifluoromethyl group; R2 is hydrogen or lower alkyl; and R3 is hydrogen or at least a substituent selected from a halogen atom, a hydroxy, lower alkyl and lower alkoxy group, and their pharmaceutically acceptable inorganic or organic acid addition salts.
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