Patent ID: 7378424

Claim:
A method to treat asthma or to cause bronchial dilation in a mammal in need thereof, which method comprises administering to said mammal an effective, non-toxic amount of a compound of formula I: wherein each of R 1 and R 2 independently represents a C 1-6 alkyl or C 2-7 acyl group; R 5 represents a hydrogen atom or a C 1-3 alkyl, C 2-3 alkenyl or C 2-3 alkynyl group; R 6 represents a hydrogen atom or a C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, amino, C 1-6 alkylamino, di(C 1-6 ) alkylamino or C 2-7 acylamino group; each of R 7 and R 8 independently represents a hydrogen or halogen atom or a hydroxy, trifluoromethyl, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 2-7 acyl, C 1-6 alkylthio, C 1-6 alkoxy, C 3-6 cycloalkyl; and R 9 represents a hydrogen or halogen atom or a hydroxy, trifluoromethyl, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 2-7 acyl, C 1-6 alkylthio, C 1-6 alkoxy or C 3-6 cycloalkyl group; X represents a group CR 3 R 4 , wherein each of R 3 and R 4 independently represents a hydrogen atom or a C 1-3 alkyl group; each of R 10 and R 11 independently represents a hydrogen atom, a C 1-3 alkyl, C 3-6 cycloalkyl or phenyl group; Y represents an oxygen atom or a group CHNO 2 , NCN, NH or NNO 2 ; n is an integerfrom 2 to 4; or a salt thereof.