| 摘要 |
There is disclosed a heterocyclic compound represented by general formula: (See Fig. I) wherein R1 represents hydrogen, lower alkyl or aryl; R2 represents hydrogen, hydroxyl or lower alkyl; A represents CH or N; X represents -O- or -NH-; R3 represents hydrogen, hydroxyl or lower alkyl; R4 represents lower alkyl; and n represents 0 or 1, or a pharmaceutically acceptable salt thereof. The compound and pharmaceutically acceptable salt are useful as antiemetics and suppressant of migraine.
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