Abstract: Methods for inhibiting and/or reversing tau filament formation or polymerization are provided. These methods can be used for treating certain neurological disorders in vivo by administering pharmaceutical compositions which inhibit and/or reverse tau filament formation or polymerization. An especially preferred pharmaceutical composition contains an inhibitor of the general formula I
wherein R1 is an aliphatic radical having one to six carbon atoms and wherein R2 and R3 independently are a second aliphatic radical having one to six carbon atoms, a hydroxyl-substituted aliphatic radical having one to six carbon atoms, or a pheny radical or a pharmaceutically acceptable salt of the inhibitor.