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: BE - Induced seizures occurred more frequently and had significantly longer latencies than those induced by equimolar amounts of cocaine .
### Output Text:
<span class="chemical">BE</span> - Induced seizures occurred more frequently and had significantly longer latencies than those induced by equimolar amounts of <span class="chemical">cocaine</span> . 