A compound represented by the following general formula [1] or a pharmaceuticallyacceptable salt thereof. [Chemical formula 1] [1] In the general formula [1],one of X and Y represents CH and the other represents oxygen or sulfur； R representshydrogen, etc.； Z represents hydrogen, etc.； Ar represents phenyl, etc.； andn is 1 or 2 and m is 1 or 2, provided that not both of n and m are 2. Also provided is a medicinalcomposition containing the compound or pharmaceutically acceptable salt thereofas an active ingredient. The composition is usable as an agent for the preventionor treatment of depression, panic disorders, anxiety, obsessive-compulsivedisorders, chronic pain, fibromyalgia, obesity, stress urinary incontinence,overactive bladder, etc.
