A compound of formula (I); in free or pharmaceutically acceptable salt
form, where R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, m, n, w, X, Y
and Q have the meanings as indicated in the specification, are useful for
treating conditions mediated by the CRTh.sub.2 receptor, especially
inflammatory or obstructive airways diseases.