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: Moreover , numerous patchy , well - limited fibrotic areas , compatible with post - necrotic tissue repair , were found after 6 - month temsirolimus therapy .
### Output Text:
Moreover , numerous patchy , well - limited fibrotic areas , compatible with post - necrotic tissue repair , were found after 6 - month <span class="chemical">temsirolimus</span> therapy . 