Novel 1,3-dihydro-benzimidazol-2-ylidene amine derivatives of formula the addition salts and stereochemically isomeric forms wherein each Alk is C1-6alkanediyl； Q is hydrogen； C1-6alkyl substituted with one or two Ar2 radicals； C1-6alkyl substituted with quinolinyl, oxazolidinyl, thiazolidinyl, morpholinyl, thiomorpholinyl, or with pyrrolidinonyl； &mdash；CO&mdash；Ar2； or Q is a radical of formula wherein t is 1, 2 or 3； R4 is amino, mono-or di(C1-6alkyl)amino； R1 is Ar2, &mdash；CO&mdash；Ar2 or a monocyclic or bicyclic heterocycle which may optionally be substituted； R2 is as R1 and additionally can be hydrogen； where Q is other than hydrogen, R3 is hydrogen； and where Q is other than hydrogen, R3 is a radical: wherein R6 is hydrogen, C1-6alkyl, substituted C1-6alkyl； R7, R8, R9 are halo, cyano, C1-6alkyl, substituted C1-6alkyl, C2-6alkenyl, cyanoC2-6alkenyl, C2-6alkynyl, cyanoC2 6alkynyl, Ar1, R10a&mdash；0&mdash；, R10a&mdash；S&mdash；, &mdash；N(R5aR5b), R10a&mdash；O&mdash；C(&boxH；O)&mdash；, N(R5aR5b)&mdash；C(&boxH；O)&mdash；, R10a&mdash；C(&boxH；O)&mdash；NR5b&mdash；, R10b&mdash；C(&boxH；O)&mdash；O&mdash；； and R8 and/or R9 may also be hydrogen； which are RSV inhibitors. Compositions containing these compounds and processes for preparing these compounds and compositions.
