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: From a registry of all cocaine - related deaths in Dade County , Florida , from 1969 - 1990 , 58 EDDs were compared with 125 victims of accidental cocaine overdose without excited delirium .
### Output Text:
From a registry of all <span class="chemical">cocaine</span> - related deaths in Dade County , Florida , from 1969 - 1990 , 58 EDDs were compared with 125 victims of accidental <span class="chemical">cocaine</span> overdose without excited delirium . 