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: The typical fluoxetine - induced symptoms of restlessness , constant pacing , purposeless movements of the feet and legs , and marked anxiety were indistinguishable from those of neuroleptic - induced akathisia .
### Output Text:
The typical <span class="chemical">fluoxetine</span> - induced symptoms of restlessness , constant pacing , purposeless movements of the feet and legs , and marked anxiety were indistinguishable from those of neuroleptic - induced akathisia . 