In the sentence extracted from biomedical literature, identify all the chemical entities. The required answer format is the same sentence with HTML <span> tags to mark up specific entities. 
### Entity Markup Guides:
Use <span class="chemical"> to denote a chemical.

### Input Text: PURPOSE : To report the treatment outcomes of the fluocinolone acetonide intravitreal implant ( 0 . 59 mg ) in patients with birdshot retinochoroidopathy whose disease is refractory or intolerant to conventional immunomodulatory therapy .
### Output Text:
PURPOSE : To report the treatment outcomes of the <span class="chemical">fluocinolone acetonide</span> intravitreal implant ( 0 . 59 mg ) in patients with birdshot retinochoroidopathy whose disease is refractory or intolerant to conventional immunomodulatory therapy . 