Patent ID: 8901146

Claim:
A compound of formula I or a salt thereof wherein: R 1 and R 2 form, together with the N atom to which they are bound, a saturated heterocyclic group which contains 1 N atom and does not contain any other heteroatom, wherein the heterocyclic group is substituted with one —NR a R b group and is optionally substituted with one or more C 1-4 alkyl groups; wherein the heterocyclic group is a 4- to 7-membered monocyclic group, R a represents H or C 1-4 alkyl; R b represents H or C 1-4 alkyl; or R a and R b form, together with the N atom to which they are bound, an azetidinyl, pyrrolidinyl, piperidinyl, or azepanyl group that is optionally substituted with one or more C 1-4 alkyl groups; R 3 represents H or C 1-8 alkyl; R 4 represents C 1-8 alkyl optionally substituted with one or more halogen, C 3-10 cycloalkyl-C 0-4 alkyl, heterocycloalkyl-C 0-4 alkyl, aryl-C 0-4 alkyl, or heteroaryl-C 0-4 alkyl; wherein any C 0-4 alkyl in the C 3-10 cycloalkyl-C 0-4 alkyl, heterocycloalkyl-C 0-4 alkyl, aryl-C 0-4 alkyl and heteroaryl-C 0-4 alkyl groups is optionally substituted with one or more R 6 groups, any of the cycloalkyl and heterocycloalkyl groups are optionally substituted with one or more substituents independently selected from C 1-8 alkyl and halogen, and any of the aryl and heteroaryl groups are optionally substituted with one or more R 7 groups; each R 5 independently represents H or C 1-8 alkyl; each R 6 independently represents C 1-8 alkyl, halogen, hydroxyC 0-6 alkyl, C 3-10 cycloalkyl optionally substituted with one or more C 1-8 alkyl groups, or phenyl optionally substituted with one or more R 8 ; and optionally two R 6 groups on the same carbon atom are bonded together to form a —C 2-5 alkylene- group that is optionally substituted with one or more C 1-8 alkyl groups; each R 7 independently represents C 1-8 alkyl, haloC 1-6 alkyl, halogen, C 1-6 alkoxy, haloC 1-6 alkoxy, —CN, C 1-6 alkylthio, C 2-4 alkynyl, hydroxyC 0-6 alkyl, CO 2 R 9 —C 0-6 alkyl, C 3-10 cycloalkyl, heterocycloalkyl, aryl or heteroaryl; wherein any of the cycloalkyl, heterocycloalkyl, aryl or heteroaryl groups in R 7 are optionally substituted with one or more C 1-8 alkyl groups; each R 8 independently represents C 1-8 alkyl, haloC 1-6 alkyl, halogen, C 1-6 alkoxy, haloC 1-6 alkoxy or —CN, each R 9 independently represents H or C 1-8 alkyl, and n represents 1 or 2.