The invention provides compounds of formula (I) ##STR00001## wherein m R.sup.1, n, R.sup.2, q, X, Y, Z, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, R.sup.8, t, and R.sup.9 are as defined in the specification, processes for their preparation, pharmaceutical compositions containing them and their use in therapy.