| abstract |
As used herein, a compound of formula I, II, IIIa, IIIb, V, VIa, VIb, VII, VIII, IX or XI: or a pharmaceutically acceptable salt thereof, a pharmaceutical composition comprising a compound of Formula I, II, IIIa, IIIb, V, VIa, VIb, VII, VIII, IX or X, and, for example, in the treatment of CNS-related disorders Methods of using the compounds are provided. |