cycloalkyl or a C4-C9 saturated heterocyclyl, wherein each ring carbon is optionallysubstituted with R.sup.33, a ring carbon other than the ring carbon at the point of attachment of B to A is optionally substituted with oxo provided that no more than one ring carbon is substituted by oxo at the same time, ring carbons and a nitrogenadjacent to the carbon atom at the point of attachment are option