Patent ID: 7271162

Claim:
A method of treating in a mammal a condition selected from at least one of schizophrenia, bipolar disorders, or psychosis, the method comprising administering to a mammal a pharmaceutically effective amount of a compound of formula I or a pharmaceutically acceptable salt thereof: wherein: R 1 and R 2 are each independently selected from hydrogen, alkyl of 1-6 carbon atoms, cycloalkyl of 3 to 7 carbon atoms, alkoxy of 1-6 carbon atoms, halogen, fluorinated alkyl of 1 to 6 carbon atoms, —CN, —NH—SO 2 -alkyl of 1-6 carbon atoms, —SO 2 —NH-alkyl of 1-6 carbon atoms, alkyl amide of 1-6 carbon atoms, amino, alkylamino of 1-6 carbon atoms, dialkylamino of 1-6 carbon atoms per alkyl moiety, fluorinated alkoxy of 1-6 carbon atoms, acyl of 2-7 carbon atoms, or aroyl; R 3 and R 4 are each independently hydrogen, C 1 -C 6 alkyl, C 3 -C 7 cycloalkyl or —CH 2 —C 3 -C 7 cycloalkyl; R 5 is hydrogen or C 1 -C 6 alkyl; R 6 is hydrogen or C 1 -C 6 alkyl; and the dashed line indicates an optional double bond.