| abstract |
A compound of formula (I):n or a pharmaceutically acceptable salt thereof, wherein R, is a hydrogen atom or a C 1-6 alkyl group, R 2 , R 3 and R 4 are the same or different and are selected from hydrogen, hydroxyl, halogen, C 1-4 alkyl, C 1-4 alkoxy and C 1-4 alkanoyl; G is a hydrogen atom or a hydroxyl group, and m and n are independently integers of from 1 to 3, with the proviso that when G is a hydroxyl group, m or n is 1; is useful in the treatment of asthma. |