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: In this report , we describe a patient with acute hyperkinetic delirium connected with a high serum total fluoxetine ( fluoxetine plus desmethylfluoxetine ) concentration .
### Output Text:
In this report , we describe a patient with acute hyperkinetic delirium connected with a high serum total <span class="chemical">fluoxetine</span> ( <span class="chemical">fluoxetine</span> plus <span class="chemical">desmethylfluoxetine</span> ) concentration . 