Compounds of the formula ##STR00001## are useful for treating the
cognitive deficits due to aging, stroke, head trauma, Alzheimer's disease
or other neurodegenerative diseases, or schizophrenia and are also useful
for the treatment of disorders such as anxiety, aggression and stress,
and for the control of various physiological phenomena, such eating
disorders, disorders of thermoregulation, and sleep and sexual
dysfunction.