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 with desipramine reversed the changes of convulsive activity of lidocaine and cocaine induced by repeated administration of desipramine .
### Output Text:
Co - administration of <span class="chemical">lidocaine</span> with <span class="chemical">desipramine</span> reversed the changes of convulsive activity of <span class="chemical">lidocaine</span> and <span class="chemical">cocaine</span> induced by repeated administration of <span class="chemical">desipramine</span> . 