The present invention relates to a novel class of phenylmorpholine and phenyl thiomorpholine compounds useful as alpha2C adrenergic receptor agonists, pharmaceutical compositions containing the compounds, and methods of treatment, prevention, inhibition,- or amelioration of one or more diseases associated with the alpha2C adrenergic receptor agonists, such as allergic rhinitis, congestion, pain, diarrhea, glaucoma, congestive heart failure, cardiac ischemia, manic disorders, depression, anxiety and schizophrenia.
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