Patent ID: 7071193

Claim:
A compound of formula (I) or a pharmaceutically acceptable salt thereof: in which R 1 represents a C 3 –C 7 carbocyclic, C 1 –C 8 alkyl, C 2 –C 6 alkenyl or C 2 –C 6 alkynyl group, each of groups being optionally substituted by one or more substituent groups independently selected from halogen atoms, —OR 4 , —NR 5 R 6 , —CONR 5 R 6 , —COOR 7 , —NR 8 COR 9 , —SR 10 , —SO 2 R 10 , —SO 2 NR 5 R 6 , —NR 8 SO 2 R 9 or an aryl or heteroaryl group, both of which may be optionally substituted by one or more substituents independently selected from halogen atoms, cyano, nitro, —OR 4 , —NR 5 R 6 , —CONR 5 R 6 , —COOR 7 , —NR 8 COR 9 , —SR 10 , —SO 2 R 10 , —SO 2 NR 5 R 6 , —NR 8 SO 2 R 9 , C 1 –C 6 alkyl or trifluoromethyl groups; one of R 2 and R 3 is hydrogen and the other is C 1 –C 8 alkyl substituted by hydroxy and one or more methyl or ethyl groups, R 4 represents hydrogen, C 1 –C 6 alkyl or a phenyl group the latter two of which may be optionally substituted by one or more substituent groups independently selected from halogen atoms, phenyl, —OR 11 and —NR 12 R 13 R 5 and R 6 independently represent a hydrogen atom or a C 1 –C 6 alkyl or phenyl group the latter two of which may be optionally substituted by one or more substituent groups independently selected from halogen atoms, phenyl, —OR 14 and —NR 15 R 16 , —CONR 15 R 16 , —NR 15 COR 16 , —SONR 15 R 16 , NR 15 SO 2 R 16 or R 5 and R 6 together with the nitrogen atom to which they are attached form a 4- to 7-membered saturated heterocyclic ring system optionally containing a further heteroatom selected from oxygen and nitrogen atoms, which ring system may be optionally substituted by one or more substituent groups independently selected from phenyl, —OR 14 , —COOR 14 , —NR 15 R 16 , —CONR 15 R 16 , —NR 15 COR 16 , —SONR 15 R 16 , NR 15 SO 2 R 16 or C 1 –C 6 alkyl, itself optionally substituted by one or more substituents independently selected from halogen atoms and —NR 15 R 16 and —OR 17 groups; R 10 represents a hydrogen atom or a C 1 –C 6 -alkyl or a phenyl group, the latter two of which may be optionally substituted by one or more substituent groups independently selected from halogen atoms, phenyl, —OR 17 and —NR 15 R 16 ; and each of R 7 , R 8 , R 9 , R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R 17 independently represents a hydrogen atom or a C 1 –C 6 , alkyl, or a phenyl group.