| abstract |
Benzopyran and benzoxazine derivatives represented by general formula (I) and the use thereof as a K<+> channel activator for treating asthma, epilepsy and so forth, wherein R1 and R2 represent each lower haloalkyl; R3 represents hydrogen, etc.; R4 represents a heterocyclic group, A-O- (A being a ring structure), etc.; R5 and R6 represent each lower haloalkyl; and X represents =N-, N->O or (II) (R7 and R8 being each hydrogen, hydroxyl, etc.). <CHEM> |