| 摘要 |
A benzopyran derivative represented by general formula (I), which has a K<+> channel activating function and thus can be widely applied as antiasthmatic, antiepileptic, and so forth. In formula (I), R1 represents hydrogen or hydroxy; R2 and R3 represent each lower alkyl, etc.; R4 and R5 represent each hydrogen, lower haloalkyl, halogeno, nitro, etc.; X represents =O, =S, = N-CN, etc.; and Y represents hydroxy, substituted amino, etc. <CHEM> |
