Benzimidazoles of formula (I): wherein: - one of X and Y is an N atom or a substituted C atom, and the other is CH； - L is a single bond, C1-3 alkylene, C2-3 alkenylene or C2-3 alkynylene； - R1 is C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl, 3- to 10-membered cycloalkyl, 5- to 10-membered heterocyclyl or 5- to 12- membered heteroaryl, each of which is unsubstituted or substituted； - Z is halo, C1-6 haloalkyl, nitro, -CN, -N(R2)2, -OR2, -SR2, -S(=O)R2, or -S(=O)2R2； - each R2 is independently hydrogen, C1-6 alkyl, C2-6 alkenyl or C2-6 alkynyl, wherein said alkyl, alkenyl and alkynyl groups are unsubstituted or substituted； and - m is 0 or 1； and the pharmaceutically acceptable salt thereof are inhibitors of RSV and can therefore be used to treat or prevent an RSV infection.本發明係關於式(I)之苯并咪唑：其中：- X及Y中之一者為N原子或經取代之C原子，且另一者為CH；- L為單鍵、C1-3伸烷基、C2-3伸烯基或C2-3伸炔基；- R1為C1-6烷基、C2-6烯基、C2-6炔基、3至10員環烷基、5至10員雜環基或5至12員雜芳基，各未經取代或經取代；- Z為鹵基、C1-6鹵烷基、硝基、-CN、-N(R2)2、-OR2、-SR2、-S(=O)R2或-S(=O)2R2；- 各R2獨立地為氫、C1-6烷基、C2-6烯基或C2-6炔基，其中該等烷基、烯基及炔基未經取代或經取代；及- m為0或1；及其醫藥學上可接受之鹽，其為RSV之抑制劑，且因此可用以治療或預防RSV感染。
