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: CONCLUSION : The data suggest that fluocinolone acetonide implant ( 0 . 59 mg ) helps to control inflammation in otherwise treatment - refractory cases of birdshot retinochoroidopathy .
### Output Text:
CONCLUSION : The data suggest that <span class="chemical">fluocinolone acetonide</span> implant ( 0 . 59 mg ) helps to control inflammation in otherwise treatment - refractory cases of birdshot retinochoroidopathy . 