| abstract |
(57) [Summary] General formula (I) (Wherein the definitions of the symbols are as described in the specification.), A pharmaceutically acceptable salt thereof, or a hydrate thereof. The compound of the present invention represented by the general formula (I) It is effective as both a positive symptom and a negative symptom of schizophrenia, has few side effects such as extrapyramidal dyskinesia, and is useful as a novel antipsychotic drug with few serious side effects such as granulocytopenia. The compound is also useful as a therapeutic drug for Alzheimer's dementia and depression. |