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: The finding that cocaine - and BE - induced seizures differ in several respects suggests more than one mechanism for cocaine - induced seizures and emphasizes the importance of a cocaine metabolite , BE .
### Output Text:
The finding that <span class="chemical">cocaine</span> - and <span class="chemical">BE</span> - induced seizures differ in several respects suggests more than one mechanism for <span class="chemical">cocaine</span> - induced seizures and emphasizes the importance of a <span class="chemical">cocaine</span> metabolite , <span class="chemical">BE</span> . 