Inhibitors of HCV replication of formula (I) and the N -oxides, salts, or stereoisomers thereof, wherein each dashed line represents an optional double bond; X is N, CH and where X bears a double bond it is C; R 1 is -OR 6 , -NH-SO 2 R 7 ; R 2 is hydrogen, and where X is C or CH, R 2 may also be C 1-6 alkyl; R 3 is hydrogen, C 1-6 alkyl, C 1-6 alkoxyC 1-6 alkyl, or C 3-7 cycloalkyl; n is 3, 4, 5, or 6; R 4 and R 5 taken together with the nitrogen atom to which they are attached form a bicyclic ring system selected from formula (II) wherein said ring system may optionally be substituted with 1-3 substituents; R 6 is hydrogen; aryl; Het; C 3-7 cycloalkyl optionally substituted with C 1-6 alkyl; or C 1-6 alkyl optionally substituted with C 3-7 cycloalkyl, aryl or with Het; R 7 is aryl; Het; C 3-7 cycloalkyl optionally substituted with C 1-6 alkyl; or C 1-6 alkyl optionally substituted with C 3-7 cycloalkyl, aryl or with Het; aryl is phenyl or naphthyl, each of which may be optionally substituted with 1-3 substituents; Het is a 5 or 6 membered saturated, partially unsaturated or completely unsaturated heterocyclic ring containing 1 to 4 heteroatoms each independently selected from N, O or S, and being optionally substituted with 1-3 substituents pharmaceutical compositions containing compounds (I) and processes for preparing compounds (I). Bioavailable combinations of the inhibitors of HCV of formula (I) with ritonavir are also provided.