The present invention relates to a new compound of formula (I) ##STR00001## 6-(5-cyano-2-hydroxy-1H-indol-3-yl)pyridine-3-carboxylic acid or a pharmaceutically acceptable salt thereof, in an essentially pure and isolated form, pharmaceutical formulations containing said compounds, to the use of said active compounds in therapy, and methods of prevention and/or treatment of conditions associated with glycogen synthase kinase-3 related disorders, comprising administering to a mammal, including human in need of such prevention and/or treatment, a therapeutically effective amount of said compound, as well as a process for preparing said compound.