Patent ID: 8193223

Claim:
A compound of the formula I: wherein R 1 is selected from the group consisting of hydrogen, C 1 -C 6 alkyl and substituted or unsubstituted aryl; R 2 and R 3 are independently selected from the group consisting of hydrogen and halogen; R 4 and R 5 are independently selected from the group consisting of hydrogen, C 1 -C 6 alkyl and cycloalkyl, or form, together with the nitrogen to which they are attached, a substituted or unsubstituted heterocyclyl group; with the proviso that R 4 and R 5 are not both hydrogen, n is an integer selected from 1, 2, 3, 4, 5, 6, 7 and 8, or a pharmaceutically acceptable salt, or stereoisomer thereof.