Patent ID: 7732456

Claim:
A compound of formula (I): wherein: R 1 and R 2 are the same or different and are each independently selected from: hydrogen, optionally substituted lower alkyl, optionally substituted lower cycloalkyl, optionally substituted lower alkylcarbonyl, optionally substituted lower alkyloxycarbonyl and optionally substituted lower alkylsulfonyl; or R 1 and R 2 form an optionally substituted aliphatic nitrogen-containing heterocyclic group together with the nitrogen atom to which they bind; X 1 , X 2 and X 3 are the same or different and are each independently selected from: unsubstituted methine and nitrogen atom, provided not all of X 1 , X 2 and X 3 simultaneously stand for nitrogen; X 4 , X 5 , X 6 and X 7 are the same or different and are each independently selected from: optionally substituted methine and nitrogen, provided that three or more of X 4 , X 5 , X 6 and X 7 are not simultaneously nitrogen; Y 1 is selected from: a single bond, —O—, —NR—, —S—, —SO—, and —SO 2 —; Y 2 is selected from: optionally substituted lower alkylene, optionally substituted lower alkenylene, and optionally substituted lower cycloalkylene; Y 3 is selected from: a single bond, —O—, —NR—, —S—, —SO—, and —SO 2 —; R is selected from: hydrogen and optionally substituted lower alkyl; L is optionally substituted methylene; Z 1 and Z 2 are the same or different and are each independently selected from: a single bond and optionally substituted lower alkylene; or R 1 , L and Z 2 together form an optionally substituted aliphatic nitrogen-containing heterocyclic group with the nitrogen to which R 1 binds; and Ar stands for an optionally substituted aromatic carbocyclic group, optionally substituted heteroaromatic group or optionally substituted aliphatic carbocyclic group; or a pharmaceutically acceptable salt thereof.