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: Co - administration of lidocaine , bupivacaine or tricaine with desipramine reversed this effect .
### Output Text:
Co - administration of <span class="chemical">lidocaine</span> , <span class="chemical">bupivacaine</span> or <span class="chemical">tricaine</span> with <span class="chemical">desipramine</span> reversed this effect . 