Compounds of formula I are useful for the treatment of defiCit produced by Cognitive Aging, Stroke, Head Trauma, Alzheimer's disease and other Neurodegenerative Diseases and schizophrenia.The compounds of the invention are also useful for the treatment of disorders such as anxiety,Estes and aggression and to control many Physiological Phenomena such as thermoregulation, Appetite, sleep and sexual behaviour.
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