Patent ID: 8791101

Claim:
A compound of formulae I(A-E) having the following structure: wherein: the carbon atom designated * is in the R or S configuration; and X is phenyl, optionally substituted from 1 to 4 times with substituents as defined below in R 14 ; R 1 is H or C 1 -C 6 alkyl; R 2 is H; R 3 is H; R 4 is pyridazinyl, optionally substituted from 1 to 4 times with substituents as defined below in R 14 ; R 5 is H; R 6 is H; R 7 is H; R 8 is H; R 9 is H; and R 14 is independently selected at each occurrence from a substituent in the group consisting of halogen and C 1 -C 6 alkyl, wherein C 1 -C 6 alkyl is optionally substituted from 1 to 3 times with halogen, or an oxide thereof, or a pharmaceutically acceptable salt thereof.