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: Capsaicin injection was reproducible for secondary hyperalgesia ( ICC > 0 . 70 ) and allodynia ( ICC > 0 . 71 ) .
### Output Text:
<span class="chemical">Capsaicin</span> injection was reproducible for secondary hyperalgesia ( ICC > 0 . 70 ) and allodynia ( ICC > 0 . 71 ) . 