Compounds of formula 1 or pharmaceutically acceptable salts thereof are provided: ##STR00001## which are agonists or partial agonists of the 2C subtype of brain serotonin receptors. The compounds, and compositions containing the compounds, can be used to treat a variety of central nervous system disorders such as schizophrenia.

 
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> 6-azaindole compound

> Alkylsulphonamide quinolines

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