Aromatic amines

I Compounds of formula (I), in which Z represent O, S, SO2, CO, NR or a single bond, G represents a one or two ring, saturated or unsaturated carbocyclic or heterocyclic group optionally substituted by phenyl thrihalomethyl or at least groups selected from alkoxy C1 to 6 or halogen atoms, provided that when Z represents a single bond G does not represent phenyl, R represents hydrogen or alkyl C1-6, m and n each independently represent 2, 3 or 4, and q represents an integer from 1 to 3 inclusive, and pharmaceutically acceptable derivatives thereof. There are also described processes for producing the compounds and pharmaceutical, e.g. cardiac, compositions containing them.