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: These results indicate that daidzein might play a role in acetylcholine biosynthesis as a ChAT activator , and that it also ameliorates scopolamine - induced amnesia .
### Output Text:
These results indicate that <span class="chemical">daidzein</span> might play a role in <span class="chemical">acetylcholine</span> biosynthesis as a ChAT activator , and that it also ameliorates <span class="chemical">scopolamine</span> - induced amnesia . 