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: Furthermore , apigenin did not prevent the amnesia induced by scopolamine ( 1mg / kg , i . p . , 30 min before the acquisition ) .
### Output Text:
Furthermore , <span class="chemical">apigenin</span> did not prevent the amnesia induced by <span class="chemical">scopolamine</span> ( 1mg / kg , i . p . , 30 min before the acquisition ) . 