compound, pharmaceutical composition; use of the compound for the manufacture of a medicament for treating irritable bowel syndrome, treating pain or painful syndromes, treating urinary incontinence, treating depression, fibromyalgia, anxiety, panic disorder, agorophobia, pre-traumatic stress disorder, pre-dysphoric disorder menstrual disorder, attention deficit disorder, obsessive compulsive disorder, social anxiety disorder, generalized anxiety disorder, autism, schizophrenia, obesity, anorexia nervosa, bulimia nervosa, gilles de la tourette syndrome, vasomotor discharge, cocaine addiction, sexual dysfunction, personality threshold disorder, fibromyalgia syndrome, diabetic neuropathic pain, chronic fatigue syndrome, shy drager syndrome, raynaud syndrome, parkinson's disease, and epilepsy, method of preparing a compound of structure (a), and Method of preparing a compound of structure (b)