Patent ID: 7989654

Claim:
A pharmaceutical formulation comprising a compound of Formula I, in which A is deuterium or hydrogen, R is selected from the group consisting of C 1-6 -alkyl, C 3-10 -cycloalkyl and phenyl, which may each be substituted with C 1-3 -alkoxy, fluorine, chlorine, bromine, iodine, nitro, amino, hydroxyl, oxo, mercapto or deuterium and where the C-atom marked with a star “*” may be present in the (R)-configuration, the (S)-configuration or as a mixture of the (R)-configuration and the (S)-configuration, and a pharmaceutically active carrier, wherein the compound of Formula I is present as a free base with a salt content of below 10 wt % and wherein the compound of Formula I is present in a degree of purity of above 97 percent by weight and the pharmaceutical formulation comprises a therapeutically effective amount of the free base of the compound of Formula I.