Patent ID: 8044063

Claim:
A compound of formula I, or a pharmaceutically acceptable salt, thereof, wherein R 1 is acylamino of the formula: wherein R 3 is selected from hydrogen, N,N-dimethylaminomethyl, N,N-diethylaminomethyl, N,N-dipropylaminomethyl and N-morpholinomethyl; R 1 ′ is selected from hydrogen, C 1 -C 4 alkyl, C 1 -C 4 alkyl substituted by halogens, C 1 -C 4 alkoxy, or C 1 -C 4 alkoxy substituted by halogens, and R 2 is selected from benzyloxy, mono-, di- and tri-halobenzyloxy; and R 2 ′ is halogen.