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: Lateral antebrachial cutaneous neuropathy after steroid injection at lateral epicondyle .
### Output Text:
Lateral antebrachial cutaneous neuropathy after <span class="chemical">steroid</span> injection at lateral epicondyle . 