The present invention relates to compounds of formula (I), combinations and uses thereof for disease therapy, or a pharmaceutically acceptable salt, solvate or polymorph thereof, including all tautomers and stereoisomers thereof wherein R1 represents H; optionally substituted alkyl (wherein optional substituents include one or more substituents each independently selected from C1-6alkoxy, NH2, —NHC1-3alkyl and —N(C1-3alkyl)2); —C(O)Oalkyl; haloalkyl; haloalkoxy; or -alkylaryl; each R2 independently represents H; optionally substituted alkyl (wherein optional substituents include one or more substituents each independently selected from C1-6alkoxy, NH2, —NHC1-3alkyl and —N(C1-3alkyl)2); -alkylaryl; optionally substituted carbocyclyl (wherein optional substituents include one or more substituents each independently selected from C1-6alkyl, C1-6alkoxy, C1-6haloalkyl, C1-6haloalkoxy and halo); optionally substituted heterocyclyl (wherein optional substituents include one or more substituents each independently selected from C1-6alkyl, C1-6alkoxy, —C(O)OC1-6alkyl, —C(O)C1-6alkyl and —C(O)NHC1-6alkyl); —NHalkyl; —N(alkyl)2; amino; hydroxyl; alkoxy or halo; n represents 0, 1 or 2; R3 represents H or alkyl; R4 represents H or alkyl; R5 represents H or alkyl; W and X each independently represent C═O; C═S; or CH2; Y represents aryl; heteroaryl; optionally substituted carbocyclyl (wherein optional substituents include one or more substituents each independently selected from C1-6alkyl, C1-6alkoxy, C1-6haloalkyl, C1-6haloalkoxy and halo); or optionally substituted heterocyclyl (wherein optional substituents include one or more substituents each independently selected from C1-6alkyl, C1-6alkoxy, —C(O)OC1-6alkyl, —C(O)C1-6alkyl and —C(O)NHC1-6alkyl); and Z represents optionally substituted alkyl (wherein optional substituents include one or more substituents each independently selected from C1-6alkoxy, NH2, —NHC1-3alkyl and —N(C1-3alkyl)2); aryl; heteroaryl; -alkylaryl; -alkylheteroaryl; optionally substituted carbocyclyl (wherein optional substituents include one or more substituents each independently selected from C1-6alkyl, C1-6alkoxy, C1-6haloalkyl, C1-6haloalkoxy and halo); optionally substituted heterocyclyl (wherein optional substituents include one or more substituents each independently selected from C1-6alkyl, C1-6alkoxy, —C(O)OC1-6alkyl, —C(O)C1-6alkyl and —C(O)NHC1-6alkyl); -alkylcarbocyclyl wherein carbocyclyl is optionally substituted (wherein optional substituents include one or more substituents each independently selected from C1-6alkyl, C1-6alkoxy, C1-6haloalkoxy and halo); -alkylheterocyclyl wherein heterocyclyl is optionally substituted (wherein optional substituents include one or more substituents each independently selected from C1-6alkyl, —C(O)OC1-6alkyl, —C(O)C1-6alkyl and —C(O)NHC1-6alkyl); -arylcarbocyclyl wherein carbocyclyl is optionally substituted (wherein optional substituents include one or more substituents each independently selected from C1-6alkyl, C1-6alkoxy, C1-6haloalkoxy and halo); or -arylheterocyclyl wherein heterocyclyl is optionally substituted (wherein optional substituents include one or more substituents each independently selected from C1-6alkyl, —C(O)OC1-6alkyl, —C(O)C1-6alkyl and —C(O)NHC1-6alkyl).