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 , there is no evidence for an inflammatory origin of succinylcholine - associated myalgia .
### Output Text:
In conclusion , there is no evidence for an inflammatory origin of <span class="chemical">succinylcholine</span> - associated myalgia . 