| 摘要 |
PROBLEM TO BE SOLVED: To obtain a compound capable of resisting dysgnosia with aging and ameliorating a recognition process, having analgesic characteristics. SOLUTION: This compound is represented by formula (I) [A is pyridine, or the like; R2 is hydrogen atom, or the like; R3 is hydroxy group, or the like; R4 is phenyl group, or the like; R1 is hydrogen atom, or the like; R5 is a five- or six-membered ring which may contain a nitrogen atom combined with the ring A and another hetero atom selected from sulfur, oxygen and nitrogen; R6 is hydrogen atom, or the like], its enantiomer, a diastereoisomer, pharmacologically acceptable acid, base or their addition salts. The method for producing the compound is provided. The medicine composition comprises the compound.
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