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: In conclusion , with this case we illustrate that telaprevir as well as statins are susceptible to clinical relevant drug - drug interactions .
### Output Text:
In conclusion , with this case we illustrate that <span class="chemical">telaprevir</span> as well as <span class="chemical">statins</span> are susceptible to clinical relevant drug - drug interactions . 