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 behavioral studies , pre - treatment of mice with BD1018 , BD1063 , or LR132 significantly attenuated cocaine - induced convulsions and lethality .
### Output Text:
In behavioral studies , pre - treatment of mice with <span class="chemical">BD1018</span> , <span class="chemical">BD1063</span> , or <span class="chemical">LR132</span> significantly attenuated <span class="chemical">cocaine</span> - induced convulsions and lethality . 