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: We describe an outbreak of deaths from cocaine - induced excited delirium ( EDDs ) in Dade County , Florida between 1979 and 1990 .
### Output Text:
We describe an outbreak of deaths from <span class="chemical">cocaine</span> - induced excited delirium ( EDDs ) in Dade County , Florida between 1979 and 1990 . 