Patent ID: 7649000

Claim:
A compound according to general formula 1, or a pharmaceutically acceptable salt thereof, wherein R 1 is selected from H, lower alkyl, R 4 —CO, R 4 —O 2 CCH 2 , R 5 —OCO and R 5 —SO 2 ; R 2 is selected from (C 6 -C 10 )cycloalkylmethyl, benzyl optionally substituted with up to three groups chosen from F, Cl, Br, OH, lower alkyl and O-(lower alkyl), phenethyl optionally substituted with up to three groups chosen from F, Cl, Br, OH, lower alkyl and O-(lower alkyl) and benzyloxymethyl optionally substituted with up to three groups chosen from F, Cl, Br, OH, lower alkyl and O-(lower alkyl); R 3 is selected from H, OH and O-lower alkyl; R 4 is selected from H, lower alkyl and phenyl; and R 5 is selected from lower alkyl, phenyl and benzyl.