Patent ID: 7160905

Claim:
A compound of formula (I): wherein R a represents a group of formula (a): or a group of formula (b): R 1 represents —SO 2 R 5; R 5 represents methyl or ethyl; X 1 represents N, —C(—R 6 )— or —C(—O—R 7 )—; X 2 and X 3 independently represent N, —C(—R 8 )— or —C(—Y—R 9 )—; Y represents a bond, CH 2 , O, S, CO, NR 10 , —N(R 10 )C(O)—, —C(O)N(R 10 )—, COO, aryl, heterocyclyl or heteroaryl; R 6 represents hydrogen, halogen, —C 1-6 alkyl, —C 2-6 alkenyl, —C 3-8 cycloalkyl, —C 1-2 alkyl-C 3-8 cycloalkyl, heteroaryl, heterocyclyl or aryl; R 8 represents halogen; R 7 , R 9 and R 10 independently represent hydrogen, —C 1-6 alkyl, —C 2-6 alkenyl, —C 3-8 cycloalkyl, —C 1-2 alkyl-C 3-8 cycloalkyl, heteroaryl, heterocyclyl or aryl; W 1 represents CO or SO 2 ; R 2 represents —C 5-8 alkyl, —C 1-6 alkyl-aryl, —C 1-6 alkyl-heteroaryl, —C 1-6 alkyl-heterocyclyl, —C 1-6 alkyl-C 3-8 cycloalkyl, —C 1-6 alkyl-S-aryl, —C 1-6 alkyl-O-aryl, —C 1-6 alkyl-S-heteroaryl or —C 1-6 alkyl-O-heteroaryl; R 3 represents —C 1-6 alkyl or propargyl; R 4 represents —C 1-6 alkyl, —C 1-6 alkyl-aryl, —C 1-6 alkyl-heteroaryl, —C 1-6 alkyl-heterocyclyl, —C 3-8 cycloalkyl, —C 1-6 alkyl-C 3-8 cycloalkyl or propargyl; or a pharmaceutically acceptable salt.