| http://www.w3.org/ns/prov#value | - yl or a C4-C6 saturated heterocyclyl, wherein each ring carbon is optionally substituted with R.sup.33, a ring carbon other than the ring carbon at the point ofattachment 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 nitrogen adjacent to the carbon atom at the point of attachment are optionally sub
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