| abstract |
A compound of formula (I), or a pharmaceutically acceptable salt, hydrate, complex or pro-drug thereof, wherein one of R 1 and R 2 is H, and the other is selected fromC 1-8 -alkyl, C 3-6 -cycloalkyl and C 1-8 -alkyl-C 5-10 -aryl; R 3 is selected from ter t-butyl, cyclopentyl and 1-methylcyclopentyl; R 9 is selected from the following: (F). The invention further relates to pharmaceutical compositions comprising compounds of formula (I), and the use of such compounds in the treatment of various diseases. |