Patent ID: 8829039

Claim:
A compound of Formula I or a pharmaceutically acceptable salt thereof: Formula I wherein: R 1 , R 3 and R 4 are each independently hydrogen; R 2 is selected from the group consisting of hydrogen and halogen; R 5 , R 7 and R 17 are each independently hydrogen; R 6 is selected from the group consisting of phenyl, phenyl substituted with di-C 1-8 alkylamino, and a 5- or 6-membered heterocycloalkyl having one nitrogen as a heteroatom, optionally substituted with C 1-8 alkyl or phenyl-C 1-8 alkyl, with the proviso that when R 6 is heterocycloalkyl, the heteroatom in R 6 is not connected to other groups in Formula I directly; R 8 and R 9 may be the same or different, and are each independently selected from the group consisting of hydrogen and C 1-8 alkyl; R 15 and R 16 may be the same or different, and are each independently C 1-8 alkyl; n1, n2 and n3 are each independently an integer from 0 to 4; and m is an integer from 0 to 2; with the proviso that when R 2 is F, R 15 and R 16 are methyl group, R 8 and R 9 are hydrogen, n1+n2=0 or 1 and m=0, and R 6 can not be a piperidin-4-yl optionally substituted with C 1 -C 2 alkyl.