Patent ID: 7569593

Claim:
A compound of formula I: in which: R 1 is selected from hydrogen, —XR 3 , —XC(O)R 3 , —XSR 3 , —XS(O)R 3 , —XS(O) 2 R 3 , —XOR 4 , and—XOC(O)NR 3 R 4 ; wherein X is a bond or C 1-4 alkylene; R 2 is selected from —XR 3 , —XC(O)R 3 , —XSR 3 , and —XOC(O)NR 3 R 4 ; wherein X is a bond or C 1-4 alkylene; R 4 is selected from hydrogen and C 1-6 alkyl; R 3 is selected from C 6-10 aryl, and C 3-12 cycloalkyl; wherein any aryl, or cycloalkyl of R 3 is optionally substituted by 1 to 3 radicals selected from hydroxy, halo, nitro, C 1-6 alkyl, C 1-6 alkoxy, halo-substituted-C 1-6 alkyl, halo-substituted-C 1-6 alkoxy, —XC(O)OR 4 and —NR 4 R 5 ; wherein X is a bond or C 1-4 alkylene and R 4 and R 5 are independently selected from hydrogen and C 1-6 alkyl; and the pharmaceutically acceptable salts thereof.