| abstract |
The use of a compound of formula (II): ** Formula ** in which: R1 represents a hydrogen atom or a methyl group R2, R3 and R4 are the same or different from each other and each represent an oxo group, a hydroxyl group, a mercapto group, a hydrogen atom, a halogen atom, an alkoxy group, an aryloxy group or an acyl group; or a pharmaceutically acceptable salt or ester thereof, for the manufacture of a medicament for the treatment or prophylaxis of inflammatory diseases of the respiratory tract. |