Patent ID: 8648204

Claim:
A method of treating a disease of the respiratory tract characterized by airway obstruction, comprising administering, to a subject in need thereof, an effective amount of a compound of formula (I) as an (−) enantiomer wherein: n is 0 or 1; R1 and R2 may be the same or different, and are selected from the group consisting of: linear or branched C 1 -C 6 alkyl, optionally substituted by one or more halogen atoms; —OR3 wherein R3 is a linear or branched C 1 -C 6 alkyl optionally substituted with one or more halogen atoms or C 3 -C 7 cycloalkyl groups; and —NHSO 2 R4 wherein R4 is a linear or branched C 1 -C 4 alkyl optionally substituted with one or more halogen atoms, wherein at least one of R1 and R2 is —NHSO 2 R4, or a pharmaceutically acceptable salt thereof.