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: To our knowledge , this is the second case of minocycline - induced vasculitis satisfying the criteria .
### Output Text:
To our knowledge , this is the second case of <span class="chemical">minocycline</span> - induced vasculitis satisfying the criteria . 