Heterocyclic-substituted tricyclics of the formula ##STR00001## or a pharmaceutically acceptable salt thereof, wherein: the dotted line represents an optional single bond; represents an optional double bond; n is 0 2; Q is cycloalkyl, optionally substituted by R.sup.13 and R.sup.14; R.sup.13 and R.sup.14 are independently selected from (C.sub.1 C.sub.6)alkyl, (C.sub.3 C.sub.8)cycloalkyl, --OH, (C.sub.1 C.sub.6)alkoxy, R.sup.27-aryl(C.sub.1 C.sub.6)alkyl, heteroaryl, heteroarylalkyl, heterocyclyl...