Xanthone compounds and the use of anti-depressants

The present invention discloses a xanthone-based compounds and their use antidepressant compound is a pharmaceutically having structural formula (I) or a pharmaceutically acceptable salt thereof. The experiment shows that such compounds, having excellent antidepressant activity, antidepressant activity of the compound which is superior to venlafaxine, thus compounds of the invention and their pharmaceutically acceptable salts can be used to prepare antidepressants.