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: This first case of meloxicam related liver toxicity demonstrates the potential of this drug to induce hepatic damage .
### Output Text:
This first case of <span class="chemical">meloxicam</span> related liver toxicity demonstrates the potential of this drug to induce hepatic damage . 