Compounds represented by formula I: ##STR00001## wherein R.sup.1 is H, halogen, (C.sub.1-4)alkyl, O(C.sub.1-4)alkyl, and haloalkyl; R.sup.2 is H or (C.sub.1-4)alkyl; R.sup.3 is H or (C.sub.1-4)alkyl; R.sup.4 is (C.sub.1-4)alkyl, (C.sub.1-4)alkyl(C.sub.3-7)cycloalkyl, or (C.sub.3-7)cycloalkyl; and Q is a fused phenyl-5 or 6-membered saturated heterocycle having one to two heteroatoms selected from O and N, said Q being optionally substituted with hydroxy, or (C.sub.1-4)alkyl which in turn maybe optionally substituted with pyridinyl-N-oxide or C(O)OR wherein R is H or (C.sub.1-4)alkyl; or a salt thereof. The compounds have inhibitory activity against Wild Type, and single and double mutants strains, of HIV.