This invention provides methods of using compounds of formula Ib below to treat pulmonary disorders. wherein: R4 is hydrogen or (1-4C)alkyl; q is 0, 1, or 2; R5 is independently selected from halo, (1-4C)alkyl, and (1-4C)alkoxy, wherein each alkyl and alkoxy group is optionally substituted with from 1 to 3 fluoro substituents; R7 is hydrogen or (1-4C)alkyl; or a pharmaceuticallly acceptable salt thereof.