The invention provides compounds of the formula (I): ##STR00001## or salts, solvates, tautomers or N-oxides thereof, wherein J.sup.1-J.sup.2 is CH.dbd.CH, N.dbd.CH, CH.dbd.N, HN--C(O) or CH.sub.2CO; T is N or CH and GP is as defined in the claims. The compounds have activity as inhibitors of PKA and PKB kinases and are useful in the treatment of cancers.