| 摘要 |
Nootropic compounds of Formula I <IMAGE> wherein X is an ethylene chain or a 1,2-benzo ring; Y is carbonyl or methylene; R<1> is hydrogen or lower alkyl; and Z is an R<2>, R<3>-disubstituted diazinyl ring selected from pyridazine, pyrimidine, and pyrazine ring systems, where R<2> and R<3> are selected from H, C1-4 alkyl, alkoxy or alkylthio, CN, CF3, C2F5 or halogen, possess cognition and memory enhancing activity. |
