The present invention provides compounds of formula (I)
1
the stereoisomers and prodrugs thereof, and the pharmaceutically acceptable salts of the compounds, stereoisomers, and prodrugs, wherein R
1
, R
2
and R
3
are as defined herein; pharmaceutical formulations thereof; and use thereof in the treatment of, inter alia, conditions, diseases, and symptoms such as bipolar disorder, diabetes, dementia, Alzheimer's Disease, stroke, schizophrenia, depression, hair loss, and cancer.